RL78/G13 CHAPTER 13 SERIAL INTERFACE IICA
R01UH0146EJ0100 Rev.1.00 705
Sep 22, 2011
13.3 Registers Controlling Serial Interface IICA
Serial interface IICA is controlled by the following eight registers.
• Peripheral enable register 0 (PER0)
• IICA control register 00 (IICCTL00)
• IICA flag register 0 (IICF0)
• IICA status register 0 (IICS0)
• IICA control register 01 (IICCTL01)
• IICA low-level width setting register 0 (IICWL0)
• IICA high-level width setting register 0 (IICWH0)
• Port mode register 6 (PM6)
• Port register 6 (P6)
(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 IICAm 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 13-5. 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
Note 1
IICA1EN
Note 1
ADCEN
IICA0EN
Note 2
SAU1EN
Note 3
SAU0EN
TAU1EN
Note 1
TAU0EN
IICAmEN Control of serial interface IICAm input clock supply
0
Stops input clock supply.
• SFR used by serial interface IICAm cannot be written.
• Serial interface IICAm is in the reset status.
1
Enables input clock supply.
• SFR used by serial interface IICAm 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 interface IICAm, be sure to set the IICAmEN bit to 1 first. If IICAmEN = 0,
writing to a control register of serial interface IICAm is ignored, and, even if the register is
read, only the default value is read (except for port mode register 6 (PM6) and port register 6
(P6)).
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
Remark m = 0, 1
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