Z90251 ZILOG [Zilog, Inc.], Z90251 Datasheet - Page 69

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

Table 44 Port 4 Direction Control Register 06h: Bank C (PRT4_DRT)
Bit/
Field
P42
P41
P40
Bit
R/W
Reset
Note: R = Read W = Write X = Indeterminate
Bit/
Field
P47 I/O Definition
P46 I/O Definition
P45 I/O Definition
P44 I/O Definition
P43 I/O Definition
P42 I/O Definition
P41 I/O Definition
P40 I/O Definition
Bit
Position
2
1
0
R/W
7
1
Bit
Position
7
6
5
4
3
2
1
0
R/W
W
W
W
R
R
R
R/W
6
1
Value
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
5
1
Description
Data input on P42
Data Output on P42
Data input on P41
Data Output on P41
Data input on P40
Data Output on P40
32 KB Television Controller with OSD
Value
R/W
4
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Description
Defines P47 as Output
Defines P47 as Input-POR
Defines P46 as Output
Defines P46 as Input-POR
Defines P45 as Output
Defines P45 as Input-POR
Defines P44 as Output
Defines P44 as Input-POR
Defines P43 as Output
Defines P43 as Input-POR
Defines P42 as Output
Defines P42 as Input-POR
Defines P41 as Output
Defines P41 as Input-POR
Defines P40 as Output
Defines P40 as Input-POR
R/W
3
1
R/W
2
1
R/W
PS001301-0800
1
1
R/W
0
1
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