Fujitsu F2 MC-8FX Family, Hardware Manual

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CHAPTER 22 I
2
C
22.4 I
2
C Bus Interface Pins
This section describes the pins of the I
2
C bus interface and gives their block diagram.
■
Pins Related to I
2
C Bus Interface
The pins related to the I
2
C bus interface are the SDA0 and SCL0 pins.
●
SDA0 pin
The SDA0 pin can serve as a general-purpose I/O port, external interrupt input (hysteresis input), serial
data output pin (N-ch open-drain) for 8-bit serial I/O, and I
2
C data I/O pin (SDA0).
SDA0:When I
2
C is enabled (ICCR0:EN = 1), the SDA0 pin is automatically set as a data I/O pin to
function as the SDA0 terminal.
To use it as an input pin, enable the I
2
C operation (ICCR0: EN = 1) and write "0" to the corresponding of
bit 4 port direction register (DDR).
●
SCL0 pin
The SCL0 pin can serve as a N-ch open-drain I/O port, external interrupt input (hysteresis input), serial data
input (hysteresis input) for eight-bit serial I/O, or I
2
C serial clock I/O pin (SCL0).
SCL0:When I
2
C is enabled (ICCR0:EN = 1), the SCL0 pin is automatically set as the shift clock I/O pin to
function as the SCL0 terminal.
To use it as an input pin, enable the I
2
C operation (ICCR0: EN = 1) and write "0" to the corresponding of
bit 4 port direction register (DDR).