Z90251 ZILOG [Zilog, Inc.], Z90251 Datasheet - Page 66

• Manufacturer Part Number: Z90251
• Description: eZVision 200 Television Controllers with OSD
• Manufacturer: ZILOG [Zilog, Inc.]

Table 40 Port 2 Mode Register F6h: P2M
When P27/P26 or P25/P24 are used as I
automatically set to open-drain mode.
Table 41 Port 2 Data Register 02h: P2
Bit
R/W
Reset
Note: R = Read W = Write X = Indeterminate
Bit/
Field
P27 I/O Definition
P26 I/O Definition
P25 I/O Definition
P24 I/O Definition
P23 I/O Definition
P22 I/O Definition
P21 I/O Definition
P20 I/O Definition
Bit
R/W
Reset
Note: R = Read W = Write X = Indeterminate
R/W
W
7
1
7
x
Bit
Position
7
6
5
4
3
2
1
0
R/W
W
6
1
6
x
R/W
W
5
1
5
x
R/W
W
W
W
W
W
W
W
W
32 KB Television Controller with OSD
R/W
W
2
4
1
Value Description
4
x
C pins, then these pins are
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Defines P27 as Output
Defines P27 as Input
Defines P26 as Output
Defines P26 as Input
Defines P25 as Output
Defines P25 as Input
Defines P24 as Output
Defines P24 as Input
Defines P23 as Output
Defines P23 as Input
Defines P22 as Output
Defines P22 as Input
Defines P21 as Output
Defines P21 as Input
Defines P20 as Output
Defines P20 as Input
R/W
W
3
1
3
x
R/W
W
2
1
2
x
R/W
PS001301-0800
W
1
1
1
x
R/W
W
0
1
0
x
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