D-49
SYSTEM REGISTER QUICK REFERENCE
D.47 POLL (MASTER AND SLAVE)
Poll Status Byte
POLL (master and slave)
(read only)
Expanded Addr:
ISA Addr:
Reset State:
master slave
F020H F0A0H
0020H 00A0H
XXH XXH
7 0
INT — — — — L2 L1 L0
Bit
Number
Bit
Mnemonic
Function
7 INT Interrupt Pending:
0 = No request pending.
1 = Indicates that a device attached to the 82C59A requires servicing.
6–3 — Reserved. These bits are undefined.
2–0 L2:0 Interrupt Request Level:
When bit 7 is set, these bits indicate the highest-priority IR signal that
requires servicing. When bit 7 is clear, i.e., no request is pending, these
bits are indeterminate.
To Next Page
Loading...
