Z8 Encore! XP® 4K Series
Product Specification
59
Table 42. IRQ1 Enable Low Bit Register (IRQ1ENL)
BITS
7
6
5
4
3
2
1
0
PA7VENL PA6CENL PA5ENL
PA4ENL
PA3ENL
PA2ENL
PA1ENL
PA0ENL
FIELD
RESET
R/W
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
PA7VENL—Port A Bit[7] or LVD Interrupt Request Enable Low Bit
PA6CENL—Port A Bit[6] or Comparator Interrupt Request Enable Low Bit
PAxENL—Port A Bit[x] Interrupt Request Enable Low Bit
IRQ2 Enable High and Low Bit Registers
Table 43 describes the priority control for IRQ2. The IRQ2 Enable High and Low Bit reg-
isters (Tables 44 and 45) form a priority encoded enabling for interrupts in the Interrupt
Request 2 register.
Table 43. 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
Medium
High
where x indicates the register bits from 0–7.
Table 44. IRQ2 Enable High Bit Register (IRQ2ENH)
BITS
7
6
5
4
3
2
1
0
Reserved
C3ENH
C2ENH
C1ENH
C0ENH
FIELD
RESET
R/W
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
FC7H
ADDR
Reserved—Must be 0.
C3ENH—Port C3 Interrupt Request Enable High Bit
C2ENH—Port C2 Interrupt Request Enable High Bit
PS022815-0206
Interrupt Controller
ZILOG [ ZILOG, INC. ]
