Intel 386 D.47 POLL (MASTER AND SLAVE)

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 hi ghest-priority IR signal that
requires servicing. When bit 7 is clear, i.e., no request is pending, these
bits are indeter minate.