Lucent Technologies MN10285K - Manual (Page 287)

I/O Ports
I/O Port Control Registers
Panasonic Semiconductor Development Company MN102H75K/F75K/85K/F85K LSI User Manual
286
Panasonic
To turn off the OSD block to save
power:
1. Write a 0 to OSD (OSD1, bit
10).
2. Wait for the next VSYNC input.
3. Write a 0 to OSDPOFF (PCNT0,
bit 7), turning the clock off.
If you turn the clock off before the
VSYNC input, power usage may
not drop or the microcontroller
may halt.
OSDPOFF: OSD circuit enable
Setting this bit to 0 shuts off the system clock supply to the OSD block,
reducing power dissipation. The program must write a 1 to this bit before
writing any values to the OSD registers.
0: Disable
1: Enable
PLLPOFF: PLL circuit enable
0: Enable
1: Stop
ADC1ON: ADC circuit enable for closed-caption decoder 1
0: Disable
1: Enable
ADC0ON: ADC circuit enable for closed-caption decoder 0
0: Disable
1: Enable
HCNTOFF: H counter circuit enable
0: Enable
1: Disable
RMCOFF: IR remote signal receiver circuit enable
0: Enable
1: Disable
VBI1OFF: Closed-caption decoder 1 circuit enable
0: Enable
1: Disable
VBI0OFF: Closed-caption decoder 0 circuit enable
0: Enable
1: Disable
Setting the HCNTOFF, RMCOFF, VBI1OFF, or VBI0OFF bits to 1 shuts
off the system clock supply to the associated block, which reduces power
dissipation.