Z87C33 Datasheet, PDF (42/72 Pages) Zilog, Inc. – CMOS Z8® MCU Consumer Controller Processor

Z87C33
CMOS Z8“ MCU Consumer Controller Processor
36
Port 2 Mode Register
The Port 2 Mode Register, P2M, controls Port 2 I/O functions. WRITE and reset
states for bits D7–D0 are listed in Table 21.
Table 21. Port 2 Mode Register—P2M F6h/R246 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
1
1
1
1
1
1
1
1
Note: W = Write.
Bit
Position
D7–D0
Bit
Field
P20–P27
Reset
R/W State Description
W
1 P20–P27 I/O Definition
0: Defines bit as Output
1: Defines bit as Input
Port 3 Mode Register
The Port 3 Mode Register P3M controls Port 3 I/O functions. WRITE and reset
states for bits D7–D0 are listed in Table 22.
Table 22. Port 3 Mode Register—P3M F7h/R247 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
0
0
0
0
0
0
0
Note: W = Write.
Bit
Position
D7–D2
D1
Bit
Field
Reserved
Port 3
D0
Port 2
Reset
R/W State Description
W
00 Reserved—must be 00
W
0 Port 3
0: P31, P32 DIGITAL mode
1: P31, P32 ANALOG mode
W
0 Port 2
0: Open-Drain
1: Push-Pull
PS015601-1003