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5 POWER-DOWN CONTROL
A-66 EPSON S1C33L03 PRODUCT PART
Function Control bit "1" "0" Default
System clock switch over CLKCHG(D2)/
Power control register(0x40180)
OSC3 OSC1 OSC3
High-speed (OSC3) oscillation ON/OFF control SOSC3(D1)/
Power control register(0x40180)
ON OFF ON
System clock division ratio selection CLKDT(D[7:6])/
Power control register(0x40180)
"11" = 1/8
"10" = 1/4
"01" = 1/2
"00" = 1/1
1/1
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 Control bit "1" "0" Default
Prescaler ON/OFF PSCON(D5)/Power control register(0x40180) ON OFF ON
16-bit timer 0 clock control P16TON0(D3)/16-bit timer 0 clock control register(0x40147) ON OFF OFF
16-bit timer 0 Run/Stop PRUN0(D0)/16-bit timer 0 control register(0x48186) RUN STOP STOP
16-bit timer 1 clock control P16TON1(D3)/16-bit timer 1 clock control register(0x40148) ON OFF OFF
16-bit timer 1 Run/Stop PRUN1(D0)/16-bit timer 1 control register(0x4818E) RUN STOP STOP
16-bit timer 2 clock control P16TON2(D3)/16-bit timer 2 clock control register(0x40149) ON OFF OFF
16-bit timer 2 Run/Stop PRUN2(D0)/16-bit timer 2 control register(0x48196) RUN STOP STOP
16-bit timer 3 clock control P16TON3(D3)/16-bit timer 3 clock control register(0x4014A) ON OFF OFF
16-bit timer 3 Run/Stop PRUN3(D0)/16-bit timer 3 control register(0x4819E) RUN STOP STOP
16-bit timer 4 clock control P16TON4(D3)/16-bit timer 4 clock control register(0x4014B) ON OFF OFF
16-bit timer 4 Run/Stop PRUN4(D0)/16-bit timer 4 control register(0x481A6) RUN STOP STOP
16-bit timer 5 clock control P16TON5(D3)/16-bit timer 5 clock control register(0x4014C) ON OFF OFF
16-bit timer 5 Run/Stop PRUN5(D0)/16-bit timer 5 control register(0x481AE) RUN STOP STOP
8-bit timer 0 clock control P8TON0(D3)/8-bit timer 0/1 clock control register(0x4014D) ON OFF OFF
8-bit timer 0 Run/Stop PTRUN0(D0)/8-bit timer 0 control register(0x40160) RUN STOP STOP
8-bit timer 1 clock control P8TON1(D7)/8-bit timer 0/1 clock control register(0x4014D) ON OFF OFF
8-bit timer 1 Run/Stop PTRUN1(D0)/8-bit timer 1 control register(0x40164) RUN STOP STOP
8-bit timer 2 clock control P8TON2(D3)/8-bit timer 2/3 clock control register(0x4014E) ON OFF OFF
8-bit timer 2 Run/Stop PTRUN2(D0)/8-bit timer 2 control register(0x40168) RUN STOP STOP
8-bit timer 3 clock control P8TON3(D7)/8-bit timer 2/3 clock control register(0x4014E) ON OFF OFF
8-bit timer 3 Run/Stop PTRUN3(D0)/8-bit timer 3 control register(0x4016C) RUN STOP STOP
8-bit timer 4 clock control P8TON4(D3)/8-bit timer 4/5 clock control register(0x40145) ON OFF OFF
8-bit timer 4 Run/Stop PTRUN4(D0)/8-bit timer 4 control register(0x40174) RUN STOP STOP
8-bit timer 5 clock control P8TON5(D7)/8-bit timer 4/5 clock control register(0x40145) ON OFF OFF
8-bit timer 5 Run/Stop PTRUN5(D0)/8-bit timer 5 control register(0x40178) RUN STOP STOP
A/D converter clock control PSONAD(D3)/A/D clock control register(0x4014F) ON OFF OFF
A/D conversion enable ADE(D2)/A/D enable register(0x40244) RUN STOP STOP