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RL78/G1A CHAPTER 12 SERIAL ARRAY UNIT
R01UH0305EJ0200 Rev.2.00 410
Jul 04, 2013
12.3.1 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 12-4. Format of Peripheral Enable Register 0 (PER0)
Address: F00F0H After reset: 00H R/W
Symbol <7> <6> <5> <4> <3> <2> <1> <0>
PER0 RTCEN 0 ADCEN IICA0EN SAU1EN
Note
SAU0EN 0 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.
Note 32, 48, and 64-pin products only.
Cautions 1. When setting serial array unit m, be sure to first set the following registers with the SAUmEN
bit set to 1. If SAUmEN = 0, control registers of serial array unit m become default values and
writing to them is ignored (except for the input switch control register (ISC), noise filter enable
register 0 (NFEN0), port input mode registers 0, 1 (PIM0, PIM1), port output mode registers 0, 1,
5, 7 (POM0, POM1, POM5, POM7), Port mode contorol registers 0, 1, 3, 5, 7 (PMC0, PMC1,
PMC3, PMC5, PMC7), port mode registers 0, 1, 3, 5, 7 (PM0, PM1, PM3, PM5, PM7), and port
registers 0, 1, 3, 5, 7 (P0, P1, P3, P5, P7)).
• 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)
• Serial standby control register m (SSCm)
2. Be sure to clear the following bits to 0.
25-pin products: bits 1, 3, 6
32, 48, 64-pin products: bits 1, 6
Remark m: Unit number (m = 0, 1)
<R>