MSM82C59A-2GS 查看數據表（PDF） - Oki Electric Industry

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MSM82C59A-2GS

PROGRAMMABLE INTERRUPT CONTROLLER

Oki Electric Industry 

¡ Semiconductor

MSM82C59A-2RS/GS/JS

(ii) Initialization Command Word 3 (ICW3)

This command word is written when there is more than one MSM82C59A-2 used in

cascade connections in the system, and is loaded into an 8-bit slave register. The

functions of this slave register are listed below.

a. In a master mode system (BUF = 1 and M/ S = 1 in ICW4 or SP/EN = 1). “1” is set

in each bit where a slave has been connected.

In 85 mode, the master MSM82C59A-2 releases byte 1 of the CALL sequence to

enable the corresponding slave to release byte 2 or 3 (only byte 2 in 86 mode) through

the cascade line.

b. In slave mode (BUF = 1 and M/S = 0 in ICW4 or SP/EN = 0). Bits 0 thru 2 identify

the slave. The slave compares these bits with the cascade input, and releases bytes

2 and 3 of the CALL sequence (only byte 2 in 86 mode) if a matching result is obtained.

(iii) Initialization Command Word 4 (ICW4)

SFNM: Special Fully Nested Mode is programmed when SFNM = 1.

BUF: Buffered mode is programmed when BUF = 1. In Buffered mode, SP/EN is an

output, and Master/slave is selected by the M/S bit.

M/S: If buffered mode is selected, the MSM82C59A-2 is programmed as the master

when M/S = 1, and as a slave when M/S = 0. M/S is ignored, however, when

BUF = 0.

AEOI: Automatic End Of Interrupt mode is programmed by AEOI = 1.

mPM: (Microprocessor mode)

The MSM82C59A-2 is set to 85 system operation when mPM = 0, and to 86

system operation when mPM = 1.

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