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RL78/G1A CHAPTER 5 CLOCK GENERATOR
R01UH0305EJ0200 Rev.2.00 152
Jul 04, 2013
5.3.6 Peripheral enable register 0 (PER0)
These registers are used to enable or disable supplying the clock to the peripheral hardware. Clock supply to the
hardware that is not used is also stopped so as to decrease the power consumption and noise.
To use the peripheral functions below, which are controlled by this register, set (1) the bit corresponding to each
function before specifying the initial settings of the peripheral functions.
• Real-time clock, 12-bit interval timer
• A/D converter
• Serial interface IICA0
• Serial array unit 1
• Serial array unit 0
• Timer array unit 0
The PER0 register can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears these registers to 00H.
Figure 5-7. Format of Peripheral Enable Register 0 (PER0) (1/3)
Address: F00F0H After reset: 00H R/W
Symbol <7> 6 <5> <4> <3> <2> 1 <0>
PER0 RTCEN 0 ADCEN IICA0EN
SAU1EN SAU0EN 0 TAU0EN
RTCEN Control of real-time clock (RTC) and 12-bit interval timer input clock supply
0
Stops input clock supply.
• SFR used by the real-time clock (RTC) and 12-bit interval timer cannot be written.
• The real-time clock (RTC) and 12-bit interval timer are in the reset status.
1
Enables input clock supply.
• SFR used by the real-time clock (RTC) and 12-bit interval timer can be read and written.
Caution Be sure to clear the following bits to 0.
25-pin products: bits 1, 3, 6
32, 48, 64-pin products: bits 1, 6