Z90251 Datasheet, PDF (76/97 Pages) Zilog, Inc. – eZVision 200 Television Controllers with OSD

Z90255 ROM and Z90251 OTP
32 KB Television Controller with OSD
68
Table 53 IR Capture Register 1 04h: Bank C (IR_CP1)
Bit
7
6
5
4
3
2
1
0
R/W
Reset
R
R
R
R
R
R
R
R
0
0
0
0
0
0
0
0
Note: R = Read W = Write X = Indeterminate
Bit/
Field
IR Capture Register 1
Bit
Position
R/W Value Description
7,6,5,4,3,2,1,0 R
Reading High Byte of IR
Capture Data
9 Pulse Width Modulators
The Z90255 has 11 Pulse Width Modulator channels. PWM1 through PWM10 have
6-bit resolution and are typically used for audio and video level control. PWM11 has
14-bit resolution and is typically used for voltage synthesis tuning. PWM11 uses
two registers to accommodate its 14-bit resolution. PWM6 can be configured as
either 14-bit or 6-bit.
9.1 PWM Mode Register
PWM Mode Register (Table 54) controls the setting of multiplexed pins 1-7. These
pins can be configured to function as PWM output ports or regular output ports. If
a bit is reset to 0, the pin outputs the PWM signal. If a bit is set to 1, the pin is a
regular output port.
Table 54 PWM Mode Register 0Dh: Bank B (P_MODE)
Bit
7
6
5
4
R/W
R/W R/W R/W R/W
Reset
0
1
1
1
Note: R = Read W = Write X = Indeterminate
3
R/W
1
2
1
0
R/W R/W R/W
1
1
1
PS001301-0800