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CHAPTER 17 SERIAL INTERFACE IIC0 ( µ PD780344Y, 780354Y SUBSERIES ONLY)
17.4 I
2
C Bus Mode Functions
17.4.1 Pin configuration
The serial clock pin (SCL0) and serial data bus pin (SDA0) are configured as follows.
(1) SCL0 ········· This pin is used for serial clock input and output.
This pin is an N-ch open-drain output for both master and slave devices. Input is Schmitt input.
(2) SDA0 ········· This pin is used for serial data input and output.
This pin is an N-ch open-drain output for both master and slave devices. Input is Schmitt input.
Since outputs from the serial clock line and the serial data bus line are N-ch open-drain outputs, an external pull-
up resistor is required.
Master device
Clock output
V
SS0
(Clock input)
Data output
V
SS0
Data input
Figure 17-7. Pin Configuration Diagram
V
DD0
SCL0
V
DD0
SDA0
User's Manual U15798EJ2V0UD
Slave device
SCL0
(Clock output)
V
SS0
Clock input
SDA0
Data output
V
SS0
Data input
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