RL78/G15 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0959EJ0110 Rev.1.10 Page 394 of 765
Mar 7, 2023
12.4 Operation Stop Mode
Each serial interface of serial array unit has the operation stop mode.
In this mode, serial communication cannot be executed, thus reducing the power consumption.
In addition, the pin for serial interface can be used as port function pins in this mode.
12.4.1 Stopping the Operation by Units
The stopping of the operation by units is set by using peripheral enable register 0 (PER0).
The PER0 register is used to enable or disable the supply of a clock signal to various on-chip peripheral modules. Clock
supply to an on-chip peripheral module that is not to be used can be stopped to decrease power consumption and noise.
To stop the operation of serial array unit 0, set bit 2 (SAU0EN) to 0.
Figure 12-19. Peripheral Enable Register 0 (PER0) Setting When Stopping the Operation by Units
(a) Peripheral enable register 0 (PER0) … Set only the bit of SAUm to be stopped to 0.
Symbol 7 6 5 4 3 2 1 0
PER0 TMKAEN CMPEN ADCEN IICA0EN
SAU0EN TAU0EN
× × × × 0 0/1 0 ×
Control of SAUm input clock
0: Stops supply of input clock
1: Supplies input clock
Caution 1. If SAUmEN = 0, writing to the registers which control serial array unit m is ignored, and, even if the
register is read, only the initial value is read.
Note that this does not apply to the following registers.
Input switch control register (ISC)
Noise filter enable register 0 (NFEN0)
Port output mode registers 0, 2, 4 (POM0, POM2, POM4)
Port mode control registers 0, 2 (PMC0, PMC2)
Port mode registers 0, 2, 4 (PM0, PM2, PM4)
Port registers 0, 2, 4 (P0, P2, P4)
Caution 2. Be sure to clear bits 3 and 1 to 0.
Remark
: Setting disabled (set to the initial value)
×: Bits not used with serial array units (depending on the settings of other peripheral functions)
0/1: Set to 0 or 1 depending on the usage of the user.
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