PIL APG-MID/14/8431
Dated 21 Apr 2014
BOLERO FAMILY : ERRATA SHEET Update
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PRODUCT INFORMATION
LETTER
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PIL APG-MID/14/8431 - Dated 21 Apr 2014
Sales Type/product family label SPC560B/C/Dxx, SPC56ECxx, SPC564Bxx
Type of change Product electrical spec. change
Reason for change ERRATA SHEET UPDATE
Description Please be informed that Errata Sheet for Bolero Family has been
updated.
Forecasted date of implementation 30-Apr-2014
Forecasted date of samples for customer 14-Apr-2014
Forecasted date for STMicroelectronics
change Qualification Plan results availability 30-Apr-2014
Involved ST facilities NA
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PIL APG-MID/14/8431 - Dated 21 Apr 2014
DOCUMENT APPROVAL
Name Function
Duncan, Martin Russell Marketing Manager
Brambilla, Daniele Alfred Product Manager
Mervic, Alberto Q.A. Manager
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BOLERO FAMILY : ERRATA SHEET Update
WHAT:
Please be informed that Errata Sheet for Bolero Family has been updated.
HOW:
See attached ERR004146.
WHO:
All The products belonging to BOLERO Family:
SPC560B/C/Dxx
•
SPC56ECxx
•
SPC564Bxx
•
ERR004146: When an ADC conversion is injected, the
aborted channel is not restored under certain conditions
Description:
When triggered conversions interrupt the ADC, it is possible that the aborted conversiondoes not get restored to
the ADC and is not converted during the chain. Vulnerable configurations are:
• Injected chain over a normal chain
• CTU trigger over a normal chain
• CTU trigger over an injected chain
When any of these triggers arrive whilst the ADC is in the conversion stage of the sample and conversion, the
sample is discarded and is not restored. This means that the channel data register will not show the channel as
being valid and the CEOCFRx field will not indicate a pending conversion. The sample that was aborted is lost.
When the trigger arrives during the final channel in a normal or injected chain, the same failure mode can cause
two ECH/JECH interrupts to be raised.
If the trigger arrives during the sampling phase of the last channel in the chain, an ECH is triggered
immediately, the trigger is processed and the channel is restored and after sampling/conversion, a second ECH
interrupt occurs.
In scan mode, the second ECH does not occur if the trigger arrives during the conversion phase. In one-shot
mode, the trigger arriving during the conversion phase of the last channel restarts the whole conversion chain
and the next ECH occurs at completion of thatchain.
Workaround:
It is suggested that the application check for valid data using the CDR status bits or the CEOCFRx registers to
ensure all expected channels have converted. This can be tested by running a bitwise AND and an XOR with
either the JCMRx or NCMRx registers and the CEOCFRx registers during the ECH of JECH handler. Any non-
zero value for ( xCMRx & (xCMRx CEOCFRx ) ) indicates that a channel has been missed and conversion
should be requested again.
Spurious ECH/JECH interrupts can be detected by checking the NSTART/JSTART flags in the ADC Module
Status Registers – if the flag remains set during an ECH/JECH interrupt then another interrupt will follow after
the restored channel or chain has been sampled and converted.
The spurious ECH/JECH workaround above applies to single-shot conversions. In singleshot mode, NSTART
changes from 1 to 0. Therefore, the user can rely on checking the NSTART bit to confirm if a spurious ECH has
occurred. However, for scan mode, the NSTART bit will remain set during normal operation, so it cannot be
relied upon to check for the spurious ECH/JECH issue. Consequently, if CTU is being used in trigger mode, the
conversions must be single-shot and not scan mode.
PIL APG-MID/14/8431 - Dated 21 Apr 2014
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