ATAM894P ATMEL [ATMEL Corporation], ATAM894P Datasheet

ATAM894P

Manufacturer Part Number

ATAM894P

Description

MARC4 4-bit Microcontrollers

Manufacturer

ATMEL [ATMEL Corporation]

Datasheet

1.ATAM894P.pdf (3 pages)

Current page: 1 of 3
Download datasheet (45Kb)

DI Errata

•

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.

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

Errata Sheet

Rev. 4813A–4BMCU–06/04

Related parts for ATAM894P

ATAM894P Summary of contents

Page 1

... If the command following the NOP, the interrupt active register usually is cleared correctly after an RTI and executing interrupts then continues normally. MARC4 4-bit Microcontrollers ATAM893S ATAM894P ATAR092/892P ATAR090/890H ATAR080F ATA6020N ATAR510F ...

Page 2

... 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 ...

Page 3

Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Asia Room 1219 ...

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