MSM82C59A-2GS 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM82C59A-2GS

PROGRAMMABLE INTERRUPT CONTROLLER

Oki Electric Industry 

¡ Semiconductor

MSM82C59A-2RS/GS/JS

(6) Operation Command Words (OCW1 thru OCW3)

When Initialization Command Words (ICWs) are programmed in the MSM82C59A-2, the

interrupt input line is ready to receive interrupt requests. The Operation Command Words

(OCWs) enable the MSM82C59A-2 to be operated in various modes while the device is in

operation.

(i) Operation Command Word 1 (OCW1)

OCW1 sets and resets the mask bits of the Interrupt Mask Register (IMR). M0 thru M7

represent 8 mask bits. The channel is masked when M = 1, but is enabled when M = 0.

(ii) Operation Command Word 2 (OCW2)

R, SL, EOI: The Priority Rotation and End of Interrupt mode plus combinations of the

two are controlled by combinations of these 3 bits. These combinations are

listed in the operation command word format table.

L2, L1, L0: These bits indicate the specified interrupt level when SL = 1.

(iii) Operation Command Word 3 (OCW3)

ESMM: This enables the Special Mask Mode. The special mask mode can be set and

reset by the SMM bit when ESMM = 1. The SMM bit is ignored when ESMM

= 0.

SMM: (Special Mask Mode)

The MSM82C59A-2 is set to Special Mask Mode when ESMM = 1 and SMM =

1, and is returned to normal mask mode when ESMM = 1 and SMM = 0. SMM

is ignored when ESMM = 0.

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