IA186EM_11 Datasheet, PDF (142/146 Pages) InnovASIC, Inc – 8-Bit/16-Bit Microcontrollers

IA186EM/IA188EM
8-Bit/16-Bit Microcontrollers
Data Sheet
February 25, 2011
9. Errata
The following errata are associated with Version 03 of the IA186EM/IA188EM. A workaround
to the identified problem has been provided where possible.
9.1 Errata Summary
Table 97 presents a summary of errata.
Table 97. Summary of Errata
Errata
No.
1
Problem
There is a difference in how priority of timer interrupts are asserted between the
original AMD part and the Innovasic part.
Ver. 03
Exists
2 Lock up just after reset is released.
Exists
3 Intermittent startup.
Exists
4 Timer Operation in continuous mode.
Exists
5 DMA interrupt will not bring device out of halt state.
Exists
6 Does not clear the interrupt request bit for INT0 upon entering the ISR.
Exists
7 There is a difference in how hardware handshaking for UARTs during a bus hold
cycle is handled between the original AMD part and the Innovasic part.
Exists
9.2 Errata Detail
Errata No. 1
Problem: There is a difference in how priority of timer interrupts are asserted between the
original AMD part and the Innovasic part.
Description: In the original AMD part, timer interrupts cannot be interrupted by another timer
interrupt, even if the new timer interrupt is of a higher priority. The Innovasic part will interrupt
a timer interrupt with a higher-priority timer interrupt. Additionally, if a lower-priority timer
interrupt is interrupted with a higher-priority timer interrupt and another incident of the lower-
priority interrupt occurs during the processing of the higher-priority interrupt, upon execution of
the EOI, a new lower-priority interrupt will be initiated, possibly orphaning the original lower-
priority timer interrupt.
Workaround: When using nested interrupts, at the beginning of the interrupt routine before the
global interrupts are enabled with a CLI, timer interrupts must be specifically masked. At the
®
IA211050831-19
http://www.Innovasic.com
UNCONTROLLED WHEN PRINTED OR COPIED
Customer Support:
Page 142 of 146
1-888-824-4184