Renesas RL78 Series User Manual page 548

RL78/G1D
14.3.1 Peripheral enable register 0 (PER0)
This 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.
When serial interface IICAn is used, be sure to set bits 6, 4 (IICA1EN, IICA0EN) 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 this register to 00H.
Address: F00F0H After reset: 00H
Symbol <7>
PER0 RTCEN
IICAnEN
0
1
Cautions 1. When setting serial interface IICA, be sure to set the following registers first while the
IICAnEN bit is set to 1. If IICAnEN = 0, the control registers of serial interface IICA are set to
their initial values, and writing to them is ignored (except for port mode register 6 (PM6) and
port register 6 (P6)).
• IICA control register n0 (IICCTLn0)
• IICA flag register n (IICFn)
• IICA status register n (IICSn)
• IICA control register n1 (IICCTLn1)
• IICA low-level width setting register n (IICWLn)
• IICA high-level width setting register n (IICWHn)
2. Be sure to clear bits 1 and 6 to "0".
Remark n = 0
14.3.2 IICA control register n0 (IICCTLn0)
This register is used to enable/stop I
The IICCTLn0 register can be set by a 1-bit or 8-bit memory manipulation instruction. However, set the SPIEn, WTIMn,
and ACKEn bits while IICEn = 0 or during the wait period. These bits can be set at the same time when the IICEn bit is set
from "0" to "1".
Reset signal generation clears this register to 00H.
Remark n = 0
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
Figure 14-5. Format of Peripheral Enable Register 0 (PER0)
R/W
6 <5>
0 ADCEN
Control of serial interface IICAn input clock supply
Stops input clock supply.
● SFR used by serial interface IICAn cannot be written.
● Serial interface IICAn is in the reset status.
Enables input clock supply.
● SFR used by serial interface IICAn can be read/written.
2
C operations, set wait timing, and set other I
CHAPTER 14 SERIAL INTERFACE IICA
<4> <3>
IICA0EN SAU1EN
<2> 1
SAU0EN 0
2
C operations.
<0>
TAU0EN
527