Chapter 17 Serial Interface Iic0; Functions Of Serial Interface Iic0 - NEC 78K0 Series User Manual

17.1 Functions of Serial Interface IIC0

Serial interface IIC0 has the following two modes.
(1) Operation stop mode
This mode is used when serial transfers are not performed. It can therefore be used to reduce power
consumption.
2
(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 (SCL0) line and a
serial data bus (SDA0) 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 SCL0 and SDA0 pins are used for open drain outputs, IIC0 requires pull-up resistors for the serial
clock line and the serial data bus line.
Figure 17-1 shows a block diagram of serial interface IIC0.
406

CHAPTER 17 SERIAL INTERFACE IIC0

2
C bus format and the master device can generated "start condition", "address",
2
C bus.
Preliminary User's Manual U17260EJ3V1UD