ADUC845_847_848ANOMALY Datasheet, PDF (1/4 Pages) Analog Devices – This anomaly list represents the known bugs

MicroConverter^® Multichannel 24-/16-Bit ADCs with
Embedded 62 kB Flash and Single-Cycle MCU
Anomaly Sheet for Silicon Rev. C ADuC845/ADuC847/ADuC848
This anomaly list represents the known bugs, anomalies, and workarounds for the ADuC845, ADuC847, and ADuC848 MicroConverter
products. The anomalies listed apply to all ADuC845/ADuC847/ADuC848 packaged material branded as follows:
First (CSP) / Second (PQFP) Line ADuC845 or ADuC847 or ADuC848
Third (CSP) / Fourth Line (PQFP) C20
Analog Devices, Inc. is committed, through future silicon revisions, to continuously improving silicon functionality. Analog Devices tries
to ensure that these future silicon revisions remain compatible with your present software/systems implementing the recommended
workarounds outlined here.
ADuC845/ADuC847/ADuC848 SILICON REVISION HISTORY
Silicon
Revision
Identifier
C
Kernel
Revision
Identifier
0
Chip Marking
All silicon branded
ADUC845BS or ADuC845BCP
ADuC847BS or ADuC847BCP
ADuC8484BS or ADuC848BCP
Third/Fourth Line: C20
Silicon
Status
Release
Anomaly Sheet
Rev. B
No. of Reported Anomalies
7
ANOMALIES
1. Interrupts During Reading/Writing to DATAFLASH/EE [er001]
Background:
There are 4 kB of DATAFLASH/EE that can be used for nonvolatile data storage.
Issue:
If an interrupt occurs during a DATAFLASH/EE read or write operation, code execution following the ISR may resume at
a random program memory address.
Workaround: Disable all interrupts prior to a read or write operation. This can be done by setting the EA bit to 0.
Related Issues: None.
2. PWM Operation [er002]
Background:
The PWM output rate is determined by the PWMxH and PWMxL registers for the PWM0 and PWM1 outputs.
Issue:
Modifying RAM address 2EH causes the PWM timer to be reset.
Workaround: For Assembly code: Do not use memory location 2EH.
For C code:
Assign a dummy variable to location 0x2E using the following code:
idata unsigned int ui32Dummy[2] _at_ 0x2E;
Related Issues: None.
Rev. B
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