Renesas RL78/G1P Hardware User Manual page 483

16-bit single-chip microcontroller

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The RL78/G1P has two units of serial interface IICA and support two slave addresses.

When using IICA0 and IICA1 as slaves, the corresponding slave can communicate with the master when either one of

the slave addresses matches an address received from the I

12.1 Functions of Serial Interface IICA

Serial interface IICA has the following three modes.

(1) Operation stop mode

This mode is used when serial transfers are not performed. It can therefore be used to reduce power consumption.

C bus mode (multimaster supported)

This mode is used for 8-bit data transfers with several devices via two lines: a serial clock (SCLAn) line and a serial

data bus (SDAAn) line.

This mode complies with the I

"transfer direction specification", "data", and "stop condition" data to the slave device, via the serial data bus. The

slave device automatically detects these received status and data by hardware. This function can simplify the part

of application program that controls the I

Since the SCLAn and SDAAn pins are used for open drain outputs, serial interface IICA requires pull-up resistors

for the serial clock line and the serial data bus line.

(3) Wakeup mode

The STOP mode can be released by generating an interrupt request signal (INTIICAn) when an extension code

from the master device or a local address has been received while in STOP mode. This can be set by using the

WUPn bit of IICA control register n1 (IICCTLn1).

Figure 12-1 shows a block diagram of serial interface IICA.

Remark n = 0, 1

R01UH0895EJ0100 Rev.1.00

Nov 29, 2019

CHAPTER 12 SERIAL INTERFACE IICA

C bus format and the master device can generated "start condition", "address",

CHAPTER 12 SERIAL INTERFACE IICA