Stopping The Operation By Units - Renesas RL78/G1P Hardware User Manual

16-bit single-chip microcontroller

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11.4.1 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.

Figure 11-22. 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.

Cautions 1. If SAUmEN = 0, writing to a control register of serial array unit m is ignored, and, even if the

Note that this does not apply to the following registers.

 Input switch control register (ISC)

 Noise filter enable register 0 (NFEN0)

 Port mode register 3 (PM3)

 Port register 3 (P3)

2. Be sure to clear bits 7, 3, and 1 to "0".

×: Bits not used with serial array units (depending on the settings of other peripheral functions)

: Setting disabled (set to the initial value)

0/1: Set to 0 or 1 depending on the usage of the user

R01UH0895EJ0100 Rev.1.00

Nov 29, 2019

Control of SAUm input clock

0: Stops supply of input clock

1: Supplies input clock

CHAPTER 11 SERIAL ARRAY UNIT