Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Technical Manual page 82

5 POWER-DOWN CONTROL
System clock switch over
High-speed (OSC3) oscillation ON/OFF control
System clock division ratio selection
Turning off the prescaler and peripheral circuits
Current consumption can be reduced by turning off the peripheral circuits operating at high speed as much as
possible. The peripheral circuits are as follows.
1) Peripheral circuits using the clock generated by the prescaler
• 16-bit programmable timers 0 to 5 (watchdog timer)
• 8-bit programmable timers 0 to 5 (DRAM refresh, serial interface)
• A/D converter
2) Peripheral circuits using the clock (source clock for prescaler) supplied to the prescaler
• 16-bit programmable timers 0 to 5 (watchdog timer)
• 8-bit programmable timers 0 to 5 (DRAM refresh)
• A/D converter
• Serial interface
• Input/output ports
If none of all circuits of the above 1) and 2) need to be used, turn off the prescaler. If the circuit of the above
1) or 2) need to be used, do not turn off the prescaler. When operation of the prescaler is stopped, the clock
supply to the circuits of the above 2) stops. When some these circuits of the above 1) need to be used, turn off
all other unnecessary circuits and stop the clock supply from the prescaler to those circuits.
The prescaler operating control and the clock supply control bits for each peripheral circuit are shown in the
table below.
Function
Prescaler ON/OFF
16-bit timer 0 clock control
16-bit timer 0 Run/Stop
16-bit timer 1 clock control
16-bit timer 1 Run/Stop
16-bit timer 2 clock control
16-bit timer 2 Run/Stop
16-bit timer 3 clock control
16-bit timer 3 Run/Stop
16-bit timer 4 clock control
16-bit timer 4 Run/Stop
16-bit timer 5 clock control
16-bit timer 5 Run/Stop
8-bit timer 0 clock control
8-bit timer 0 Run/Stop
8-bit timer 1 clock control
8-bit timer 1 Run/Stop
8-bit timer 2 clock control
8-bit timer 2 Run/Stop
8-bit timer 3 clock control
8-bit timer 3 Run/Stop
8-bit timer 4 clock control
8-bit timer 4 Run/Stop
8-bit timer 5 clock control
8-bit timer 5 Run/Stop
A/D converter clock control
A/D conversion enable
A-66
Function
PSCON(D5)/Power control register(0x40180)
P16TON0(D3)/16-bit timer 0 clock control register(0x40147)
PRUN0(D0)/16-bit timer 0 control register(0x48186)
P16TON1(D3)/16-bit timer 1 clock control register(0x40148)
PRUN1(D0)/16-bit timer 1 control register(0x4818E)
P16TON2(D3)/16-bit timer 2 clock control register(0x40149)
PRUN2(D0)/16-bit timer 2 control register(0x48196)
P16TON3(D3)/16-bit timer 3 clock control register(0x4014A)
PRUN3(D0)/16-bit timer 3 control register(0x4819E)
P16TON4(D3)/16-bit timer 4 clock control register(0x4014B)
PRUN4(D0)/16-bit timer 4 control register(0x481A6)
P16TON5(D3)/16-bit timer 5 clock control register(0x4014C)
PRUN5(D0)/16-bit timer 5 control register(0x481AE)
P8TON0(D3)/8-bit timer 0/1 clock control register(0x4014D)
PTRUN0(D0)/8-bit timer 0 control register(0x40160)
P8TON1(D7)/8-bit timer 0/1 clock control register(0x4014D)
PTRUN1(D0)/8-bit timer 1 control register(0x40164)
P8TON2(D3)/8-bit timer 2/3 clock control register(0x4014E)
PTRUN2(D0)/8-bit timer 2 control register(0x40168)
P8TON3(D7)/8-bit timer 2/3 clock control register(0x4014E)
PTRUN3(D0)/8-bit timer 3 control register(0x4016C)
P8TON4(D3)/8-bit timer 4/5 clock control register(0x40145)
PTRUN4(D0)/8-bit timer 4 control register(0x40174)
P8TON5(D7)/8-bit timer 4/5 clock control register(0x40145)
PTRUN5(D0)/8-bit timer 5 control register(0x40178)
PSONAD(D3)/A/D clock control register(0x4014F)
ADE(D2)/A/D enable register(0x40244)
Control bit
CLKCHG(D2)/
Power control register(0x40180)
SOSC3(D1)/
Power control register(0x40180)
CLKDT(D[7:6])/
Power control register(0x40180)
Control bit
EPSON
"1" "0" Default
OSC3 OSC1 OSC3
ON OFF ON
"11" = 1/8 1/1
"10" = 1/4
"01" = 1/2
"00" = 1/1
"1" "0" Default
ON OFF ON
ON OFF OFF
RUN STOP STOP
ON OFF OFF
RUN STOP STOP
ON OFF OFF
RUN STOP STOP
ON OFF OFF
RUN STOP STOP
ON OFF OFF
RUN STOP STOP
ON OFF OFF
RUN STOP STOP
ON OFF OFF
RUN STOP STOP
ON OFF OFF
RUN STOP STOP
ON OFF OFF
RUN STOP STOP
ON OFF OFF
RUN STOP STOP
ON OFF OFF
RUN STOP STOP
ON OFF OFF
RUN STOP STOP
ON OFF OFF
RUN STOP STOP
S1C33L03 PRODUCT PART