RL78/G1P
CHAPTER 12 SERIAL INTERFACE IICA
R01UH0895EJ0100 Rev.1.00
484
Nov 29, 2019
12.4 I
2
C Bus Mode Functions
12.4.1 Pin configuration
The serial clock pin (SCLAn) and the serial data bus pin (SDAAn) are configured as follows.
(1) SCLAn .... 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) SDAAn .... 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.
Figure 12-13. Pin Configuration Diagram
Master device
Clock output
(Clock input)
Data output
Data input
V
SS
V
SS
SCLAn
SDAAn
V
DD
V
DD
(Clock output)
Clock input
Data output
Data input
V
SS
V
SS
Slave device
SCLAn
SDAAn
Remark
n = 0, 1