IA6805E2-PDW40I-00 データシートの表示（PDF） - InnovASIC, Inc

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IA6805E2-PDW40I-00

Microprocessor Unit

InnovASIC, Inc 

IA6805E2

Microprocessor Unit

As of Production Version 00

29 August 2007

Errata

Production Version 00

1. Functional differences between IA6805E2 and Harris and Motorola Versions:

A. Stop mode on IA6805E2 will not halt oscillator. Recovery from stop will be quicker.

B. There is a functional difference between the IA6805E2 and the original device instruction

sets regarding instructions for BSET and BCLR. Analysis: The instructions, BSET and

BCLR (bit set and bit clear), are not supposed to affect the carry flag in the condition code

register but in the IA6805E2 they do. Any situations where the BSET or BCLR commands

are executed between a decision type instruction (branches) based on the carry flag and the

instruction that was to update the carry flag should be considered suspect. Workaround:

The workaround selected by the particular user is code dependent. Software will need to be

revised to address the instruction set issues noted above.

C. There is a functional difference between the IA6805E2 and the original device regarding the

external timer input. Analysis: The original device is edge sensitive on this input (negative

edge). The IA6805E has a synchronizing register on this input. If the stimulus to this input

is a negative pulse less than a clock cycle wide, it is possible that this event will be missed by

the timer circuit. Workaround: The workaround selected by the particular user is situation

dependent. The input pulse either needs to be a minimum of 1 clock cycle wide or the pulse

needs to be centered on the falling edge of the input clock.

2. Observations:

A. Original data sheets for Motorola and Harris are inconsistent when describing timer input mode 2.

Original parts and Innovasic will AND together the timer input with the inverse of the internal clock

(AS).

B. Original Harris part would unpredictably “pre-increment” timer counter when writing to timer

registers. IA6805E2 will not.

C. Original Harris part displays incorrect address on external pins during intermediate cycles (not a

functional problem) of multi-cycle instructions when accessing memory at page boundaries.

IA6805E2 will not.

D. Execution of illegal op-codes on the IA6805E2 will force a system reset. On the original Harris

and Motorola parts, execution of illegal op-codes would produce unpredictable results.

Copyright © 2007

©

IA211081401-03

Page 33 of 33

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