RL78/F13, F14 CHAPTER 15 SERIAL ARRAY UNIT
R01UH0368EJ0210 Rev.2.10 829
Dec 10, 2015
15.4.1 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 supplying the clock to the peripheral hardware. Clock supply to a hardware
macro that is not used is stopped in order to reduce the power consumption and noise.
To stop the operation of serial array unit 0, set bit 2 (SAU0EN) to 0.
To stop the operation of serial array unit 1, set bit 3 (SAU1EN) to 0.
Figure 15-23. Peripheral Enable Register 0 (PER0) Setting When Stopping the Operation by Units
Cautions 1. If SAUmEN = 0, writing to a control register of serial array unit m is ignored, and, even if the
register is read, only the default 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 input mode registers 1, 3, 5 to 7, 12 (PIM1, PIM3, PIM5 to PIM7, PIM12)
• Port output mode registers 1, 6, 7, 12 (POM1, POM6, POM7, POM12)
• Port mode registers 1, 3 to 7, 12 (PM1, PM3 to PM7, PM12)
• Port registers 1, 3 to 7, 12 (P1, P3 to P7, P12)
2. Be sure to clear the following bits to 0.
Bits 1, 3, 4, and 6 in the RL78/F13 (LIN incorporated) products with 20, 30, 32, 48, or 64 pins
and 16 Kbytes to 64 Kbytes of code flash memory
Bits 4 and 6 in 30-pin products of the RL78/F13 (CAN and LIN incorporated) and in 30-pin
products of the RL78/F14
Bit 6 in the products other than above
Remark ×: 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
m: Unit number (m = 0, 1)
(a) Peripheral enable register 0 (PER0) … Set only the bit of SAUm to be stopped to 0.
7 6 5 4 3 2 1 0
PER0 RTCEN
×
0 ADCEN
×
IICA0EN
×
SAU1EN
0/1
SAU0EN
0/1
TAU1EN
×
TAU0EN
×
Control of SAUm input clock
0: Stops supply of input clock
1: Su
lies in
ut clock
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