Z8 Encore!® 64K Series
Product Specification
71
Table 31. IRQ1 Enable High Bit Register (IRQ1ENH)
BITS
FIELD
RESET
R/W
7
6
5
4
3
2
1
0
PAD7ENH PAD6ENH PAD5ENH PAD4ENH PAD3ENH PAD2ENH PAD1ENH PAD0ENH
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
FC4H
ADDR
PADxENH—Port A or Port D Bit[x] Interrupt Request Enable High Bit
Refer to the Interrupt Port Select register for selection of either Port A or Port D as the
interrupt source.
Table 32. IRQ1 Enable Low Bit Register (IRQ1ENL)
BITS
FIELD
RESET
R/W
7
6
5
4
3
2
1
0
PAD7ENL PAD6ENL PAD5ENL PAD4ENL PAD3ENL PAD2ENL PAD1ENL PAD0ENL
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
FC5H
ADDR
PADxENL—Port A or Port D Bit[x] Interrupt Request Enable Low Bit
Refer to the Interrupt Port Select register for selection of either Port A or Port D as the
interrupt source.
IRQ2 Enable High and Low Bit Registers
The IRQ2 Enable High and Low Bit registers (Tables 34 and 35) form a priority encoded
enabling for interrupts in the Interrupt Request 2 register. Priority is generated by setting
bits in each register. Table 33 describes the priority control for IRQ2.
Table 33. IRQ2 Enable and Priority Encoding
IRQ2ENH[x] IRQ2ENL[x] Priority
Description
Disabled
Low
0
0
1
1
0
1
0
1
Disabled
Level 1
Level 2
Level 3
Nominal
High
where x indicates the register bits from 0 through 7.
PS019915-1005
Interrupt Controller
ZILOG [ ZILOG, INC. ]
