Low-Power ModesTurning Individual Functions On and OffMN102H75K/F75K/85K/F85K LSI User Manual Panasonic Semiconductor Development Company75Panasonic3.2 Turning Individual Functions On and OffYou cannot set the PLL functioncontrol bit during NORMAL mode.You must set it from the SLOWmode.To turn off the OSD block to savepower:1. Write a 0 to OSD (OSD1, bit10).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 theVSYNC input, power usage maynot drop or the microcontrollermay halt.The MN102H75K/85K allows you to turn each peripheral function on or offthrough writing to the registers. You can significantly reduce power consumptionby turning off unused functions. Table 3-1 shows the register bits controlling onand off for each function block. The ADC used for the OSD and CCD functionsis turned off on reset. Write a 1 to the function to enable it, when necessary.You cannot read from or write to the registers associated with a function that isdisabled. Turning on the function enables register reads and writes.See the sections on each of these peripheral functions for more information.Table 3-1 Peripheral Function On/Off SwitchesBlock Name Description Bit Name Address Operation Reset ValueOSDOSD block control OSDPOFF PCNT0, x’00FF90’, bit70: OSD block off1: OSD block enabled 0OSD function control OSD OSD1, x’007F06’, bit100: OSD function off1: OSD function on 0OSD register R/W control OSDREGEPCNT2, x’00FF92’, bit00: OSD register R/W off1: OSD register R/W enabled 0CCDADC control for CCD1 ADC1ON PCNT0, x’00FF90’, bit50: ADC for CCD1 off1: ADC for CCD1 enabled 0ADC control for CCD0 ADC0ON PCNT0, x’00FF90’, bit40: ADC for CCD0 off1: ADC for CCD0 enabled 0CCD1 function control VBI1OFF PCNT0, x’00FF90’, bit10: CCD1 block off1: CCD1 block enabled 0CCD0 function control VBI0OFF PCNT0, x’00FF90’, bit00: CCD0 block off1: CCD0 block enabled 0PLL PLL function control PLLPOFF PCNT0, x’00FF90’, bit60: PLL block enabled1: PLL block off 0H counter H counter function control HCNTOFF PCNT0, x’00FF90’, bit30: H counter block enabled1: H counter block off 0IR remotesignal receiverIR remote signalreceiver function control RMCOFF PCNT0, x’00FF90’, bit20: IR remote signal receiverblock off1: IR remote signal receiverblock enabled0I 2C I 2C function control I2COFF PCNT2, x’00FF92’, bit20: I2 C block enabled1: I2 C block off 0PWM PWM function control PWMOFF PCNT2, x’00FF92’, bit10: PLL block enabled1: PLL block off 0
