Renesas RL78/G13 - Page 565

RL78/G13 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0146EJ0100 Rev.1.00 546
Sep 22, 2011
(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 12-5. 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
IICA1EN
Note 1
ADCEN
IICA0EN
Note 2
SAU1EN
Note 3
SAU0EN
TAU1EN
Note 1
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.
Notes 1. 80, 100, and 128-pin products only.
2. This is not provided in the 20-pin products.
3. This is not provided in the 20, 24, and 25-pin products.
Cautions 1. When setting serial array unit m, be sure to set the SAUmEN bit to 1 first. 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 the input switch control register (ISC), noise filter
enable register 0 (NFEN0), port input mode registers 0, 1, 4, 5, 8, 14 (PIM0, PIM1, PIM4, PIM5,
PIM8, PIM14), port output mode registers 0, 1, 4, 5, 7 to 9, 14 (POM0, POM1, POM4, POM5,
POM7 to POM9, POM14), port mode registers 0, 1, 3 to 5, 7 to 9, 14 (PM0, PM1, PM3 to PM5,
PM7 to PM9, PM14), and port registers 0, 1, 3 to 5, 7 to 9, 14 (P0, P1, P3 to P5, P7 to P9, P14)).
2. Be sure to clear the following bits to 0.
20-pin products: bits 1, 3, 4, 6
24, 25-pin products: bits 1, 3, 6
30, 32, 36, 40, 44, 48, 52, 64-pin products: bits 1, 6
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