I C Bus Mode Functions; Pin Configuration - NEC 78K0 Series User Manual

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17.4 I 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
(Clock input)
Data output
V
Data input
CHAPTER 17 SERIAL INTERFACE IIC0
Figure 17-11. Pin Configuration Diagram
SCL0
SS
SDA0
SS
Preliminary User's Manual U17260EJ3V1UD
V
DD
SCL0
V
DD
SDA0
Slave device
(Clock output)
V
SS
Clock input
Data output
V
SS
Data input
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