Renesas RL78 Series User Manual page 541

RL78/G1D
14.1 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.
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(2) I 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).
Remark n = 0
Figure 14-1 shows a block diagram of serial interface IICA.
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
CHAPTER 14 SERIAL INTERFACE IICA
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C bus format and the master device can generated "start condition", "address",
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C bus.
CHAPTER 14 SERIAL INTERFACE IICA
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