I 2 C Bus Mode Functions - NEC Renesas V850/SC1 User Manual

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11.5.3 I 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.
Master device
Clock output
(Clock input)
Data output
Data input
388
CHAPTER 11 SERIAL INTERFACE FUNCTION
Figure 11-23. Pin Configuration Diagram
PORTV
DD
SCLn
PORTV
DD
SDAn
User's Manual U15109EJ3V0UD
Slave device
SCLn
(Clock output)
Clock input
SDAn
Data output
Data input