IA82510

Data Sheet

Asynchronous Serial Controller

February 25, 2011

IA211001219-05

http://www.Innovasic.com

UNCONTROLLED WHEN PRINTED OR COPIED

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Errata No. 7

Problem:

Difficulty starting oscillator with crystal.

Description:

No internal feedback resistor between X1 and X2.

Workaround:

Install external 1-10Mohm resistor.

Errata No. 8

Problem:

Intermittent and temperature sensitive crystal oscillator operation when cycling power.

Description:

Strapping state elements apparently transparent latches instead of flip flops. If flip

flop powers up to wrong state, crystal oscillator is disabled while reset is active. OK after first

reset following power-up.

Workaround:

None.

Errata No. 9

Problem:

Auto-acknowledge of interrupts via writing of LSR does not work.

Description:

Writing LSR directly sets/resets bits 4 through 0. Also writing 0 to LSR(0) – RX

FIFO – clears the RX FIFO level as seen by FLR. Writing zero to any other LSR bits clears the

corresponding LSR/RST flag, but also corrupts the FIFO location the write pointer is set to, then

increments both the write and read pointers.

Workaround:

Use other means to service interrupts, such as read of RST or RXD.

Errata No. 10

Problem:

ICM Status Clear command does not clear LSR/RST overrun error.

Description:

ICM Status Clear command should clear everything in RST/LSR, MSR, and TMST

except RST/LSR(0). Overrun error was missed.

Workaround:

Use other means to service interrupts.