UPD78F1502AGK-GAK-AX Datasheet, PDF (250/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 5 CLOCK GENERATOR
<3> If some peripheral hardware macros are not used, supply of the input clock to each hardware macro can be
stopped.
(PER0 register)
RTCEN DACEN ADCEN IICAEN SAU1EN SAU0EN TAU1EN TAU0EN
xxxEN
0
1
Stops input clock supply.
Supplies input clock.
Input clock control
Remark RTCEN:
DACEN:
ADCEN:
IICAEN:
SAU1EN:
SAU0EN:
TAU1EN:
TAU0EN:
Control of the real-time counter input clock
Control of the D/A converter input clock
Control of the A/D converter and operational amplifier input clock
Control of the serial interface IICA input clock
Control of the serial array unit 1 unit input clock
Control of the serial array unit 0 unit input clock
Control of the timer array unit 1 input clock
Control of the timer array unit 0 input clock
(4) Example of setting procedure when stopping the high-speed system clock
The high-speed system clock can be stopped (disabling clock input if the external clock is used) in the following two
ways.
• Executing the STOP instruction
• Setting MSTOP to 1
(a) To execute a STOP instruction
<1> Setting to stop peripheral hardware
Stop peripheral hardware that cannot be used in the STOP mode (for peripheral hardware that cannot be
used in STOP mode, see CHAPTER 21 STANDBY FUNCTION).
<2> Setting the X1 clock oscillation stabilization time after STOP mode is released
If the X1 clock oscillates before the STOP mode is entered, set the value of the OSTS register before
executing the STOP instruction.
<3> Executing the STOP instruction
When the STOP instruction is executed, the system is placed in the STOP mode and X1 oscillation is
stopped (the input of the external clock is disabled).
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Jun 20, 2011