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Low-Power Modes
Turning Individual Functions On and Off
You cannot set the PLL function
control bit during NORMAL mode.
You must set it from the SLOW
mode.
To turn off the OSD block to save
power:
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 the
VSYNC input, power usage may
not drop or the microcontroller
may halt.
Table 3-1 Peripheral Function On/Off Switches
Block Name
Description
OSD block control
OSD
OSD function control
OSD register R/W control
ADC control for CCD1
ADC control for CCD0
CCD
CCD1 function control
CCD0 function control
PLL
PLL function control
H counter
H counter function control
IR remote
IR remote signal
signal receiver
receiver function control
2
2
I
C
I
C function control
PWM
PWM function control
MN102H75K/F75K/85K/F85K LSI User Manual
3.2
Turning Individual Functions On and Off
The MN102H75K/85K allows you to turn each peripheral function on or off
through writing to the registers. You can significantly reduce power consumption
by turning off unused functions. Table 3-1 shows the register bits controlling on
and off for each function block. The ADC used for the OSD and CCD functions
is 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 is
disabled. Turning on the function enables register reads and writes.
See the sections on each of these peripheral functions for more information.
Bit Name
Address
PCNT0, x'00FF90', bit
OSDPOFF
7
OSD1, x'007F06', bit
OSD
10
OSDREG
PCNT2, x'00FF92', bit
E
0
PCNT0, x'00FF90', bit
ADC1ON
5
PCNT0, x'00FF90', bit
ADC0ON
4
PCNT0, x'00FF90', bit
VBI1OFF
1
PCNT0, x'00FF90', bit
VBI0OFF
0
PCNT0, x'00FF90', bit
PLLPOFF
6
PCNT0, x'00FF90', bit
HCNTOFF
3
PCNT0, x'00FF90', bit
RMCOFF
2
PCNT2, x'00FF92', bit
I2COFF
2
PCNT2, x'00FF92', bit
PWMOFF
1
75
Panasonic
Operation
0: OSD block off
1: OSD block enabled
0: OSD function off
1: OSD function on
0: OSD register R/W off
1: OSD register R/W enabled
0: ADC for CCD1 off
1: ADC for CCD1 enabled
0: ADC for CCD0 off
1: ADC for CCD0 enabled
0: CCD1 block off
1: CCD1 block enabled
0: CCD0 block off
1: CCD0 block enabled
0: PLL block enabled
1: PLL block off
0: H counter block enabled
1: H counter block off
0: IR remote signal receiver
block off
1: IR remote signal receiver
block enabled
2
0: I
C block enabled
2
1: I
C block off
0: PLL block enabled
1: PLL block off
Panasonic Semiconductor Development Company
Reset Value
0
0
0
0
0
0
0
0
0
0
0
0
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