RL78/G1H CHAPTER 14 SERIAL ARRAY UNIT
R01UH0575EJ0120 Rev. 1.20 Page 332 of 920
Dec 22, 2016
14.3.1 Peripheral enable register 0 (PER0)
PER0 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.
When serial array unit 0 is used, be sure to set bit 2 (SAU0EN) of this register to 1.
When serial array unit 1 is used, be sure to set bit 3 (SAU1EN) of this register to 1.
The PER0 register can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears the PER0 register to 00H.
Figure 14 - 4 Format of Peripheral enable register 0 (PER0)
Caution When setting serial array unit m, be sure to first set the following registers with the SAUmEN bit set
to 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 (except for noise filter enable register 0 (NFEN0), port
input mode registers, port output mode registers, port mode registers, port mode control registers,
and port registers).
• Serial clock select register m (SPSm)
• Serial mode register mn (SMRmn)
• Serial communication operation setting register mn (SCRmn)
• Serial data register mn (SDRmn)
• Serial flag clear trigger register mn (SIRmn)
• Serial status register mn (SSRmn)
• Serial channel start register m (SSm)
• Serial channel stop register m (STm)
• Serial channel enable status register m (SEm)
• Serial output enable register m (SOEm)
• Serial output level register m (SOLm)
• Serial output register m (SOm)
Address: F00F0H After reset: 00H R/W
Symbol <7> <6> <5> <4> <3> <2> <1> <0>
PER0 RTCEN IICA1EN ADCEN IICA0EN SAU1EN SAU0EN TAU1EN TAU0EN
SAUmEN Control of serial array unit m input clock supply
0 Stops supply of input clock.
• SFR used by serial array unit m cannot be written.
• Serial array unit m is in the reset status.
1 Enables input clock supply.
• SFR used by serial array unit m can be read/written.
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