DI Errata
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ATAM893S
ATAM894P
ATAR092P
ATAR892P
ATAR090H
ATAR890H
ATAR080F
ATA6020N
ATAR510F
ATAR862N3/N4/N8
MARC4 4-bit
Microcontrollers
ATAM893S
ATAM894P
ATAR092/892P
ATAR090/890H
ATAR080F
ATA6020N
ATAR510F
ATAR862N3/4/8
The latest product enhancement (PCN HC030703 DI enhancement) introduced to all
MARC4 products during 2003, leads, under some conditions, to an unforeseen and
unwanted behavior. The circuit may not process interrupts correctly. All above men-
tioned MARC4 products are affected.
Description
If a DI command is immediately followed by a CALL or SCALL command and an inter-
rupt meets this DI command, this interrupt is kept in the interrupt active register
permanently despite a correct RTI execution. Even if the EI command in the inter-
rupted program has been executed, this bit in the interrupt active register stays set
and disables the execution of any interrupt of the same or lower priority. Only an inter-
rupt with a higher priority or a reset is able to solve this blocking status.
If the command following the DI is a NOP, the interrupt active register usually is
cleared correctly after an RTI and executing interrupts then continues normally.
Errata Sheet
Rev. 4813A–4BMCU–06/04
Workaround
MTP Parts
a) Experienced customers using Atmel MTP parts (ATAM893S, ATAM894P) can modify the
HEX-file directly. Within each interrupt service routine, replace the HEX-code for CCR! in front
of the RTI with a SCALL to a free address. Introduce the HEX-codes for the commands LIT_1,
OR, CCR! and EXIT at this address. Now, with each RTI, the interrupt enable flag is set. This
software modification overrides the last hardware modification, i.e., the parts behave as if not
having received DI-enhancement, and the interrupt active register will be cleared correctly.
b1) An equivalent modification can be done in the source code, but the modification depends
on the content the compiler saved at the beginning of an interrupt service routine:
0080
: INT1
0080 0D
CCR@
0081 73
Y@
0082 72
X@
\$SAVEREG
In this case, CCR, X and Y registers were saved, therefore, the modification should look as
follows:
2>R 2>R 1 or 2R> 2R>
either at the beginning or at the end of the interrupt service routine.
b2) If only CCR and one of the registers were saved:
01E0
:INT7
01E0 0D
CCR@
01E1 73
Y@
ROT 1 or <ROT
\$SAVEREG
The modification looks as follows:
c) Customers using MTP parts may switch their order to the predecessor version.
ROM Parts
Customers using ROM parts may switch their order to the predecessor version.
Up to now it has not occurred, that parts working correctly under all conditions might fail in the
future or under different environmental conditions.
2
MARC4 4-bit Microcontrollers Errata Sheet
4813A–4BMCU–06/04
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4813A–4BMCU–06/04
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