Z90251 Datasheet, PDF (77/97 Pages) Zilog, Inc. – eZVision 200 Television Controllers with OSD

Z90255 ROM and Z90251 OTP
32 KB Television Controller with OSD
69
Bit/
Field
Bit
Position
R/W Value Description
6-bit/14-bit PWM6
7
R/W
0 Select 6-bit (POR)
1 Select 14-bit
PWM 11 / P56
6
R/W
0 Select PWM 11
1 Select P56 - POR
PWM 6* / P55
5
R/W
0 Select PWM 6
1 Select P55 - POR
PWM 5 / P54
4
R/W
0 Select PWM 5
1 Select P54 - POR
PWM 4 / P53
3
R/W
0 Select PWM 4
1 Select P53 - POR
PWM 3 / P52
2
R/W
0 Select PWM 3
1 Select P52 - POR
PWM 2 / P51
1
R/W
0 Select PWM 2
1 Select P51 - POR
PWM 1 / P50
0
R/W
0 Select PWM 1
1 Select P50 - POR
Note: PWM6 can be either 6- or 14-bit depending on the bit status in bit7.
Port 4 Pin-Out Selection Register
Bits 5, 4, 3, and 2 of the Port 4 Pin-Out Selection Register (Table 55) control the
configuration of multiplexed pins 20, 19, 18, and 17. If a bit is reset to 0, the pin
functions as a PWM output port. This value is the default following a Power-On
Reset. If a bit is set to 1, the pin functions as a programmable regular input/output
port.
Table 55 Port 4 Pin-Out Selection Register 08h: Bank C (PIN_SLT)
Bit
7
6
5
R/W
Reset
R/W R/W R/W
x
x
1
Note: R = Read W = Write X = Indeterminate
4
R/W
1
3
R/W
1
2
1
R/W R/W
1
x
0
R/W
x
PS001301-0800