Datasheet

78K0/Ix2 CHAPTER 15 SERIAL INTERFACE IICA
R01UH0010EJ0500 Rev.5.00 492
Feb 28, 2012
15.4 I
2
C Bus Mode Functions
15.4.1 Pin configuration
T
he serial clock pin (SCLA0) and serial data bus pin (SDAA0) are configured as follows.
(1) SCLA0 .... 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) SDAA0.... 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 15-14. Pin Configuration Diagram
Master device
Clock output
(Clock input)
Data output
Data input
SCLA0
SDAA0
(Clock output)
Clock input
Data output
Data input
Slave device
SCLA0
SDAA0
V SS
V SS
V DD
V DD
V SS
V SS