Z87C33 Datasheet, PDF (43/72 Pages) Zilog, Inc. – CMOS Z8® MCU Consumer Controller Processor

Z87C33
CMOS Z8“ MCU Consumer Controller Processor
37
Ports 0 and 1 Mode Register
The Ports 0 and 1 Mode Register, P01M, controls port and timing functions for
Ports 0 and 1. WRITE and reset states for bits D7–D0 are listed in Table 23.
Table 23. Ports 0 and 1 Mode Register—P01M F8h/R248 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
0
1
0
0
1
1
0
1
Note: W = Write.
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.
PS015601-1003