Z87233 Datasheet, PDF (43/71 Pages) Zilog, Inc. – CMOS Z8-R MCU Consumer Controller Processor

Z87233
CMOS Z8“ MCU Consumer Controller Processor
37
Bit
Position
D7
D6
Bit
Field
Reserved
P04–P07
D5
Reserved
D4–D3 Reserved
D2
Stack
D1
Reserved
D0
P00–P03
Reset
R/W State Description
W
0 Reserved - Must be 0
W
01 P04–P07 Mode*
0: Output
1: Input
W
0 External Memory Timing
Reserved - Must be 0
W
01 P10–P17 Mode*
00: Reserved - Must be 0
W
1 Stack Selection*
0: Reserved
1: Must be "1"
W
0 Reserved - Must be 0
W
1 P00–P03 Mode*
0: Output
1: Input
Interrupt Priority Register
The Interrupt Priority Register, IPR, prioritizes interrupt functions. WRITE and
reset states for bits D7–D0 are listed in Table 24.
Table 24. Interrupt Priority Register—IPR F9h/R249 Bank 0h: WRITE ONLY
Bit
D7
D6 D5
D4
D3
D2
D1
D0
R/W
W
W
W
W
W
W
W
W
Reset State
X
X
X
X
X
X
X
X
Note: W = Write, X = Indeterminate.
Bit
Bit Position Field
D7–D6
Reserved
D5
IRQ3, IRQ5
Reset
R/W State Description
W
XX Reserved—must be 0
W
X IRQ3, IRQ5 Priority (Group A)
0: IRQ5 > IRQ3
1: IRQ3 > IRQ5
PS022701-0104