Z90251 Datasheet, PDF (89/97 Pages) Zilog, Inc. – eZVision 200 Television Controllers with OSD

Z90255 ROM and Z90251 OTP
32 KB Television Controller with OSD
81
Table 70 3-Bit ADC Data Register 00h: Bank C (3ADC_DTA)
Bit
7
6
5
4
R/W
Reset
R/W R/W R/W R/W
x
0
0
0
Note: R = Read W = Write X = Indeterminate
3
R/W
0
2
R/W
x
1
R/W
x
0
R/W
x
Bit/Field
Reserved
ADC Speed
ADC Input Selection
ADC Data
Bit Position
7
6, 5
4, 3
2, 1, 0
R/W Value Description
R
Return 1
W
No effect
R/W 00 No ADC - POR
01 SCLK/2
10 SCLK/3
11 SCLK/4
R/W 00 Select ADC0 - POR
01 Select ADC 1
10 Select ADC 2
11 Select ADC 3
R/W
Digitized data from
selected ADC input
Table 71 4-Bit ADC Data Register 01h: Bank F (4ADC_DTA)
Bit
7
6
5
R/W
Reset
R/W R/W R/W
0
0
0
Note: R = Read W = Write X = Indeterminate
4
R/W
0
3
R/W
x
2
R/W
x
1
R/W
x
0
R/W
x
Bit/Field
Bit Position
R/W Value Description
ADC Speed
7, 6
R/W 00 No ADC - POR
01 SCLK/2
10 SCLK/3
11 SCLK/4
ADC Input Selection
5, 4
R/W 00 Select ADC0 - POR
01 Select ADC 1
10 Select ADC 2
11 Select ADC 3
ADC Data
3, 2, 1, 0
R/W
Digitized data from
selected ADC input
P41 must be set to input mode to select ADC1.
PS001301-0800