NXP® SemiconductorsMSE9S12C128_0M66G
Mask Set ErrataRev. February 13, 2011



MC9S12C128, Mask 0M66G


Introduction
This errata sheet applies to the following devices:

MC9S12C128, MC9S12C96, MC9S12C64, MC9S12GC128, MC9S12GC96, MC9S12GC64, MC9S12Q128, MC9S12Q96, MC9S12Q64, MC3S12Q128, MC3S12Q96, MC3S12Q64



MCU Device Mask Set Identification

The mask set is identified by a 5-character code consisting of a version number, a letter, two numerical digits, and a letter, for example 1K79X. All standard devices are marked with a mask set number and a date code.



MCU Device Date Codes

Device markings indicate the week of manufacture and the mask set used. The date is coded as four numerical digits where the first two digits indicate the year and the last two digits indicate the work week. For instance, the date code "0201" indicates the first week of the year 2002.



MCU Device Part Number Prefixes

Some MCU samples and devices are marked with an SC, PC, or XC prefix. An SC prefix denotes special/custom device. A PC prefix indicates a prototype device which has undergone basic testing only. An XC prefix denotes that the device is tested but is not fully characterized or qualified over the full range of normal manufacturing process variations. After full characterization and qualification, devices will be marked with the MC or SC prefix.



Errata System Tracking Numbers

MUCtsXXXXX is the tracking number for device errata. It can be used with the mask set and date code to identify a specific erratum.



Errata Summary


Errata NumberModule affectedBrief DescriptionWork-
around
MUCts01003 fts128k1 Array writes immediately after FPROT write do not set PVIOL flag. YES
MUCts01044 atd_10b8c Clearing of CCF flags in ATDSTAT1 by write of ATDCTL5 might not work YES
MUCts01106 mscan MSCAN: Time stamp corrupted in receive buffer YES
MUCts01493 S12_cpu Tagged breakpoints missed if tag attach and interrupt are simultaneous NO
MUCts01861 S12_bdm Possible manipulation of return address when exiting BDM active mode YES
MUCts02415 S12_mebi MEBI: Missing ECLK edge on first external access after mode switching YES
MUCts03403 spi SPI: Disabling slave SPI together with clearing CPHA while SS low locks transmit shift register for the next transmission YES
MUCts03469 atd_10b8c ATD: Abort of an A/D conversion sequence with write to ATDxCTL0/1/2/3 may not work YES
MUCts03570 mscan MSCAN: Corrupt ID may be sent in early-SOF condition YES
MUCts03662 vreg_3v3 vreg_3v3.02.08: Possible incorrect operation if device is wakened from stop mode within 4.7µs of stop mode entry NO
MUCts04076 pwm_8b6c PWM: Emergency shutdown input can be overruled YES
MUCts04159 tim_16b8c TIM:Normal Output Compare event happens on setting OC7M bit if OM/OL=0 YES
MUCts04161 tim_16b8c TIM_16B8C: Output compare pulse is inaccurate YES
MUCts04223 pwm_8b6c PWM: Wrong output level after shutdown restart in 16bit concatenated channel mode NO
MUCts04225 pwm_8b6c PWM: Wrong output value after restart from stop or wait mode NO



Array writes immediately after FPROT write do not set PVIOL flag.MUCts01003

Description

A write to the flash protection register that is immediately followed by

a flash array write will not set the PVIOL protection violation flag.

Example:
MOVB #$FB FPROT //protect lower portion of flash page $3E
STD #$55AA #$8080 //write to protected address (PVIOL flag expected,
but does not occur)

Workaround


Perform a legal write of a register immediately after writing to the

FPROT register, before writing to the flash array.

Example:
MOVB #$FB FPROT //protect lower portion of flash page $3E
MOVB #$30 FSTAT //clear error flags (legal write to register)
STD #$55AA #$8080 //write to protected address (PVIOL flag sets to show
protection violation)



Clearing of CCF flags in ATDSTAT1 by write of ATDCTL5 might not workMUCts01044

Description

Starting a new conversion by writing to the ATDCTL5 register should

clear all CCF flags in the ATDSTAT1 register.
This does not always work if the write to ATDCTL5 register
occurs near the end of an ongoing conversion.
Although all CCF flags are cleared one CCF flag might be
set again within the 1st ATD clock period of the new conversion.

Workaround


If the unexpected setting of one CCF flag can not be

accepted by the application one of the following
workarounds can be taken:
1) o Abort conversion (e.g. by write to ATDCTL3)
o pause for 2 ATD clock periods
o Start new conversion
2) o ignore first conversion sequence and clear CCF flags



MSCAN: Time stamp corrupted in receive bufferMUCts01106

Description

When the foreground receive buffer (RxFG) is read, with the Receiver

Full Flag (RXF) set, the value of the Time Stamp Register may be
incorrect due to corruption. The Time Stamp Register is written
correctly when the message is received, but may be overwritten by the
timer value at the end of a subsequent reception. The corruption can
only occur close to a data overrun, when the receive buffer FIFO is
full.

The problem occurs whenever the following two conditions are met:

1. Receive buffer system is full
All five receive buffers contain valid messages waiting to be read by
the application.

2. Another valid message is seen on the bus. This message must be sent
from another node, i.e. it must not be transmitted from the respective
msCAN module itself.

At the end of the message in 2. the Time Stamp Register of the oldest
message in the receive FIFO is overwritten.

Note: if the message in 2. passes the message filter system the Overrun
Interrupt Flag (OVRIF) is also set.

Workaround


The application software has to ensure to read the receive messages in

due time to avoid data overrun in any case. This will automatically
minimize the risk of a Time Stamp Register overwrite event.



Tagged breakpoints missed if tag attach and interrupt are simultaneous MUCts01493

Description

The errata concerns the DBG-CPU interface in DBG mode whilst configured

for tagging. If an interrupt occurs at the moment that a tag is attached
to an opcode being loaded into the instruction queue, the flag will get
set, but the part may not enter active BDM mode.

Using the DBG configuration BDM=DBGBRK=1, BEGIN=0, an event causing a
flag to be set should cause a break to BDM. The flag gets set, but the
part does not enter active BDM mode. The CPU executes the interrupt
service routine, instead, and returns to the correct position in the
program flow, but the breakpoint to BDM is missed.

The problem does not occur if the DBG module is configured for operation
in BKP mode (BKABEN=1). This is because, even if the flag bit is set,
the BKABEN bit is not cleared. On returning from the interrupt service
routine, the tag is re-applied when the PC is fetched after the
interrupt service routine, and the part enters BDM after the interrupt
service routine. In BKP mode with TRGSEL=0, no flags are set when a
taghit occurs.

In BKP mode with TRGSEL=1, the flag is also set erroneously on entering
the interrupt service routine. However, it is unlikely that a user would
be affected by the flag being set early (unless the service routine were
exceptionally long), due to the length of time needed to read out the
DBGSR (flag bits) over the BKGD pin; typically, during this time, the
part would enter active BDM when the tag is re-applied.

Workaround


None.



Possible manipulation of return address when exiting BDM active modeMUCts01861

Description

Upon leaving BDM active mode, the CPU return address is stored

temporarily for a few cycles in the BDM shift register. If a BDM command
transmission is detected during this time, the return address will be
manipulated in the BDM shift register. This situation is likely to occur
when a CPU BGND instruction is executed in user code during debugging
under the following conditions:

(i) The BDM module is not enabled AND
(ii) BDM commands are sent from the host

If this situation occurs, the CPU will execute BDM firmware and will
check the status of the ENBDM bit in the BDMSTS register. If the BDM is
disabled, the ENBDM bit will be clear, and hence the BDM firmware will
be exited and the shift register manipulation described above will occur.

Workaround


Avoid using the BGND instruction when the ENBDM bit in the BDMSTS

register is cleared.



MEBI: Missing ECLK edge on first external access after mode switchingMUCts02415

Description

If the ECLK is used as an external bus control signal (ESTR=1) the first

external access is lost after switching from a single chip mode with
enabled ECLK output to an expanded mode. The ECLK is erroneously held in
the high phase thus the first external bus access does not generate a
rising ECLK edge for the external logic to latch the address. The ECLK
stretches low after the lost access resulting in all following external
accesses to be valid.

Workaround


Enter expanded mode with ECLK output disabled (NECLK=1). Enable the ECLK

after switching the mode before executing the first external access.



SPI: Disabling slave SPI together with clearing CPHA while SS low locks transmit shift register for the next transmissionMUCts03403

Description

With the SPI configured as a slave, clearing the SPE bit (to disable 

the SPI) together with clearing the CPHA bit while the SS pin is low
causes the transmit shift register to be locked for the next
transmission following the SPI being re-enabled as a slave with SS
still being low.

This means new transmit data is not accepted for the first
transmission after re-enabling the SPI (indicated by SPTEF staying low
after storing transmit data into SPIDR), but for the next following
transmission.



Workaround


When disabling the slave SPI, CPHA should not be cleared at the same time. 




ATD: Abort of an A/D conversion sequence with write to ATDxCTL0/1/2/3 may not workMUCts03469

Description

Starting a conversion with a write to ATDxCTL5 or on an external 

trigger event, and aborting immediately afterwards with a write to
ATDxCTL0, ATDCTL1, ATDxCTL2 or ATDxCTL3 can fail to stop the
conversion process.




Workaround


Only write to ATDxCTL4 to abort an ongoing conversion sequence.


Use the recommended start and abort procedures from the Block Guide.
Section : Initialization/Application Information
Subsection: Setting up and starting an A/D conversion
Subsection: Aborting an A/D conversion






MSCAN: Corrupt ID may be sent in early-SOF conditionMUCts03570

Description

The initial eight ID bits will be corrupted if a message is set up for

transmission during the third bit of INTERMISSION and a dominant bit is
sampled leading to an early-SOF*.

The CRC is calculated from the resulting bit stream so that the
receiving nodes will still validate the message.

An early-SOF condition may only occur if the oscillators in the network
operate at a tolerance range which could lead to a cumulated phase error
after 11 bit times larger than phase segment 2.

In case arbitration is lost during transmission of the corrupt
identifier, a non-corrupted ID will be sent with the next attempt if the
transmit request remains active.

*The CAN protocol condition referred to as 'early-SOF' in this erratum
is detailed in "Bosch CAN Specification Version 2.0" Part A, section 9,
and a Note to section 3.2.5 INTERFRAME SPACING – INTERMISSION in Part B.

Workaround


Due to increased oscillator tolerance a transmission start in the third

bit of intermission is possible and allowed. The errata can be avoided
when calculating the maximum oscillator tolerance of the overall CAN
system. The phase error after 11 bit times due to the oscillator
tolerance should be smaller than phase segment 2.

If an early-SOF cannot be avoided the following methods will provide
prevention:

- Assigning the same value to all upper eight ID bits in the network
- Allocating dedicated data length codes (DLC) to every identifier used
in the network and checking for correspondence after reception
- Assigning only IDs (x) which do not consist of a combination of other
assigned IDs (y,z) and using the acceptance filters to reject
erroneous messages, i.e.
- for standard frames: IDx[11:0] != {IDy[11:3], IDz[2:0]}
- for extended frames: IDx[28:21] != {IDy[28:21],IDz[20:0]}



vreg_3v3.02.08: Possible incorrect operation if device is wakened from stop mode within 4.7µs of stop mode entryMUCts03662

Description

It is possible that after the device enters Stop or Pseudo-Stop mode it

may reset rather than wake up normally upon reception of the wake-up
signal.

CONDITIONS:
This will only happen provided ALL of the following conditions are met:
1) Device is powered by the on-chip voltage regulator.
2) Device enters stop or pseudo-stop mode by execution of STOP
instruction by the CPU (providing the S-bit in CCR is cleared)
NOTE: The part enters stop mode either after 12 oscillator clock cycles
with the PLL disengaged or 3 PLL clock cycles and 8 oscillator clock
cycles with the PLL engaged after the STOP command is executed.
3) The wake-up signal is activated within a specific very short
window (typically 11ns long, not longer than 20ns). The position of the
window varies between different devices, however it never starts sooner
than 1.6µs and never ends later than 4.7µs after the stop mode entry.
This really narrow width of the susceptible window (20ns maximum) makes
the erratum unlikely to ever show in the applications life.

The incorrect behavior will never occur if ANY of the wake-up conditions
are met at the time when the stop mode entry is attempted (an enabled
interrupt is pending).

EFFECT:
If this incorrect behavior occurs, the device will Reset and indicate a
Low Voltage Reset (LVR) as the reset source.
The device will operate normally after the reset.

Workaround


None.


--

Asynchronous Low Voltage Resets are possible in any microcontroller
application (due to power supply drops) and the integrated LVR and LVI
features and dedicated LVR reset vector are provided to manage this fact
cleanly. For best practice, the application's software should be written
to recover from a Low Voltage Reset in a controlled manner.
An application software written to deal with valid Low Voltage Resets
should correctly manage erroneous LVR events.

It can also be possible to avoid erroneous Low Voltage Resets from
synchronous wake-up events by configuring the application software to
ensure that the entry into stop occurs at such a time, in relation to
the wake-up event timer, that a wake-up event does not occur within
1.6µs to 4.7µs after Stop/Pseudo-Stop entry.



PWM: Emergency shutdown input can be overruledMUCts04076

Description

If the PWM emergency shutdown feature is enabled (PWM5ENA=1) and PWM

channel 5 is disabled (PWME5=0) another lower priority function
available on the related pin can take control over the data direction.
This does not lead to a problem if input mode is maintained. If the
alternative function switches to output mode the shutdown function may
unintentionally be triggered by the output data.



Workaround


When using the PWM emergency shutdown feature the GPIO function on the

pin associated with PWM channel 5 should be selected as an input.

In the case that this pin is selected as an output or where an
alternative function is enabled which could drive it as an output,
enable PWM channel 5 by setting the PWME5 bit. This prevents an
active shutdown level driven on the (output) pin from resulting in an
emergency shutdown of the enabled PWM channels.





TIM:Normal Output Compare event happens on setting OC7M bit if OM/OL=0 MUCts04159

Description

When an OC7M bit is set, an erroneous normal output compare event can 

happen on a timer port if the compare action is selected as "Timer
disconnected from output pin logic ".

Corresponding configuration:
* TIOSx = 1 --> Output compare mode
* OMx = OLx = 0 --> Output compare logic disconnected from the pin
* OC7Mx = 1 --> Mask bit set for OC7 event







Workaround


Set OC7Mx = 1 only for channels where the output compare action should 

drive the pin, and OC7Mx = 0 for all other channels where the pin is
required to be disconnected from the output compare logic.



TIM_16B8C: Output compare pulse is inaccurateMUCts04161

Description

The pulse width of an output compare (which resets the free running

counter when TCRE = 1) will measure one more bus clock cycle than
expected.



Workaround


The specification has been updated. Please refer to revision 01.09 (07

May 2010) or later.

In description of bitfield TCRE in register TSCR2,a note has been added:
TCRE=1 and TC7!=0, the TCNT cycle period will be TC7 x "prescaler
counter width" + "1 Bus Clock". When TCRE is set and TC7 is not equal to
0, then TCNT will cycle from 0 to TC7. When TCNT reaches TC7 value, it
will last only one bus cycle then reset to 0.









PWM: Wrong output level after shutdown restart in 16bit concatenated channel modeMUCts04223

Description

When the PWM is used in 16-bit (concatenation) channel and the 

emergency
shutdown feature is being used, after de-asserting PWM channel 5
(note:PWMRSTRT should be set) the PWM channels (PP0-PP4) do not show
the
state which is set by PWMLVL bit when the 16-bit counter is non-zero.



Workaround


None. 




PWM: Wrong output value after restart from stop or wait modeMUCts04225

Description

In low power modes (stop/p-stop/wait ?PSWAI=1) and during PWM PP5

de-assert and when PWM counter reaching 0, the PWM channel outputs
(PP0-PP4) cannot keep the state which is set by PWMLVL bit.




Workaround


None. 



© NXP Semiconductors, Inc., 2011. All rights reserved.