RL78/G1H CHAPTER 15 SERIAL INTERFACE IICA
R01UH0575EJ0120 Rev. 1.20 Page 434 of 920
Dec 22, 2016
15.3.1 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.
Figure 15 - 5 Format of Peripheral enable register 0 (PER0)
Caution 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)
Remark
n = 0, 1
15.3.2 IICA control register n0 (IICCTLn0)
This register is used to enable/stop I
2
C operations, set wait timing, and set other I
2
C operations.
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, 1
Address: F00F0H After reset: 00H R/W
Symbol <7> <6> <5> <4> <3> <2> <1> <0>
PER0 RTCWEN IICA1EN ADCEN IICA0EN SAU1EN SAU0EN TAU1EN TAU0EN
IICAnEN Control of serial interface IICAn input clock supply
0 Stops input clock supply.
• SFR used by serial interface IICAn cannot be written.
• Serial interface IICAn is in the reset status.
1 Enables input clock supply.
• SFR used by serial interface IICAn can be read/written.
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