MC68332 REGISTER SUMMARY
USER’S MANUAL D-15
This field selects an address space to be used by the chip-select logic.
IPL — Interrupt Priority Level
This field determines interrupt priority level when a chip select is used for interrupt ac-
knowledge. It does not affect CPU interrupt recognition.
AVEC
— Autovector Enable
Do not enable autovector support when in synchronous mode.
0 = External interrupt vector enabled
1 = Autovector enabled
Option Register Function Summary
MODE BYTE R/W
STRB DSACK SPACE IPL AVEC
0 = ASYNC 00 = Disable 00 = Rsvd 0 = AS 0000 = 0 WAIT 00 = CPU SP 000 = All 0 = Off
1 = SYNC 01 = Lower 01 = Read 1 = DS
0001 = 1 WAIT 01 = User SP 001 = Priority 1 1 = On
10 = Upper 10 = Write 0010 = 2 WAIT 10 = Supv SP 010 = Priority 2
11 = Both 11 = Both 0011 = 3 WAIT 11 = S/U SP 011 = Priority 3
0100 = 4 WAIT 100 = Priority 4
0101 = 5 WAIT 101 = Priority 5
0110 = 6 WAIT 110 = Priority 6
0111 = 7 WAIT 111 = Priority 7
1000 = 8 WAIT
1001 = 9 WAIT
1010 = 10 WAIT
1011 = 11 WAIT
1100 = 12 WAIT
1101 = 13 WAIT
1110 = F term
1111 = External
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