Z86L972 Datasheet, PDF (65/91 Pages) Zilog, Inc. – Low-Voltage Microcontrollers

Z86L972/Z86L973/Z86L974
Low-Voltage Microcontrollers
58
Interrupt Request Register
The IRQ, as described in Table 21, is a read/write register that stores the interrupt
requests for both vectored and polled interrupts. When an interrupt request is
made by any of the six interrupts, the corresponding bit in the IRQ is set to 1.
Table 21. IRQ (Group/Bank 0Fh, Register A)
Bit
7
6
5
Bit/Field
Set
Interrupt Edge IRQ5
R/W
R/W R/W R/W
Reset
0
0
0
R = Read, W = Write, X = Indeterminate
Bit
Position Bit/Field
R/W
76______ Interrupt Edge R/W
Trigger
__5_____ Set IRQ₅
R
R
W
W
___4____ Set IRQ₄
R
R
W
W
____3___ Set IRQ₃
R
R
W
W
_____2__ Set IRQ₂
R
R
W
W
______1_ Set IRQ₁
R
R
W
W
_______0 Set IRQ₀
R
R
W
W
4
Set
IRQ4
R/W
0
Value
11
10
01
00
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
3
Set
IRQ3
R/W
0
2
Set
IRQ2
R/W
0
1
Set
IRQ1
R/W
0
0
Set
IRQ0
R/W
0
Description
P51 Rise/FallingP52 Rise/Falling
P51 Rising P52 Falling
P51 FallingP52 Rising
P51 FallingP52 Falling
IRQ₅ Inactive
IRQ₅ Active
Set IRQ₅
Reset IRQ₅
IRQ₄ Inactive
IRQ₄ Active
Set IRQ₄
Reset IRQ₄
IRQ₃ Inactive
IRQ₃ Active
Set IRQ₃
Reset IRQ₃
IRQ₂ Inactive
IRQ₂ Active
Set IRQ₂
Reset IRQ₂
IRQ₁ Inactive
IRQ₁ Active
Set IRQ₁
Reset IRQ₁
IRQ₀ Inactive
IRQ₀ Active
Set IRQ₀
Reset IRQ₀
PS010504-1002
PRELIMINARY