82C59A_06 Datasheet, PDF (12/22 Pages) Intersil Corporation – CMOS Priority Interrupt Controller

82C59A
OCW1
A₀
D₇
D₆
D₅
1
M₇
M₆
M₅
D₄
D₃
M₄
M₃
D₂
D₁
D₀
M₂
M₁
M₀
OCW2
Interrupt Mask
1 = Mask set
0 = Mask reset
A₀
D₇
D₆
D₅
D₄
D₃
D₂
D₁
D₀
0
R
SL
EOI
0
0
L₂
L₁
L₀
0 01
0 11
1 01
1 00
0 00
1 11
1 10
0 10
OCW3
Non-specific EOI command
† Specific EOI command
Rotate on non-specific EOI command
Rotate in automatic EOI mode (set)
Rotate in automatic EOI mode (clear)
† Rotate on specific EOI command
† Set priority command
No operation
End of interrupt
Automatic rotation
Specific rotation
† L₀ - L₂ are used
IR LEVEL TO BE
ACTED UPON
0 123 4 567
0 101 0 101
0 011 0 011
0 000 1 111
A₀
D₇
D₆
D₅
D₄
D₃
D₂
D₁
D₀
0
0
ESMM SMM
0
1
P
RR
RIS
READ REGISTER COMMAND
01
0
1
00
1
1
Read IR reg on Read IS reg on
No Action ^{next RD pulse next RD pulse}
1 = Poll command
0 = No poll command
SPECIAL MASK MODE
01
0
1
00
1
1
Reset special Set special
No Action ^mask
mask
FIGURE 8. 82C59A OPERATION COMMAND WORD FORMAT
12
FN2784.5
March 17, 2006