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Interrupt Controller (8259A)
RESET
The 8259A does not receive a reset signal upon power-up or when
pushbutton reset is applied to the ZT 8809A. The part powers up in an
undefined state and may drive the interrupt request to the processor.
You MUST initialize the 8259A prior to enabling processor interrupts
via software.
12-34
Содержание ZT 8809A
Страница 15: ...Tables Table B 9 J5 Pin Assignments B 17 Table B 10 J6 Pin Assignments B 18 Table B 11 J7 Pin Assignments B 19...
Страница 334: ...Jumper Configurations W49 W48 A W47 B A B W37 W66 A W50 B C J7 W67 Figure A 11 W37 W47 50 W66 W67 Jumper Blocks A 34...
Страница 346: ...Jumper Configurations W61 W60 W62 W63 W64 A B A B W65 Figure A 13 W60 W65 Jumper Block A 46...