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CHAPTER 11 SERIAL INTERFACE FUNCTION
388
User’s Manual U15109EJ3V0UD
11.5.3
I
2
C bus mode functions
(1) Pin configuration
The serial clock pin (SCLn) and serial data bus pin (SDAn) are configured as follows (n = 0, 1).
SCLn ................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.
SDAn ................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 11-23. Pin Configuration Diagram
PORTV
DD
SCLn
SDAn
SCLn
SDAn
PORTV
DD
Clock output
Master device
(Clock input)
Data output
Data input
(Clock output)
Clock input
Data output
Data input
Slave device