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INTERRUPT CONTROL UNIT
Register Name:
Register Mnemonic:
Register Function:
15
Bit
Mnemonic
ID2:0
Slave ID
NOTE: Reserved register bits are shown with gray shading. Reserved bits must be written
to a logic zero to ensure compatibility with future Intel products.
8-28
Initialization Command Word 3 (Slave)
ICW3 (accessed through SPICP1)
Sets Slave ID for slave 8259A module.
Reset
Bit Name
State
XXH
Figure 8-15. ICW3 Register — Slave ID
0
0
0
0
Function
Sets the ID for a slave 8259A module.
NOTE: The slave module in the
80C186EC/C188EC must be set to an ID of 7
(111 binary).
0
I
I
I
D
D
D
0
2
1
0
A1223-0A
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