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Section 8 I/O Ports
(4)
Pin Functions
(a)
Normal Extended Mode and Address-Data Multiplex Extended Mode
Port C pins can also function as the bus control output and IIC_2, IIC_3, and IIC_4 input/output
pins. The relationship between register setting values and pin functions are as follows.
• PC7
The PC7 pin functions as a bus control output pin.
• PC6
When set for 16-bit bus width, the PC7 pin functions as a bus control output pin. When 8-bit
bus width, the pin function is the same as that in single-chip mode.
• PC5 to PC0
The pin functions are the same as those in single-chip mode.
(b)
Single-Chip Mode
• PC7, PC6
The pin function is switched as shown below according to the PCnDDR bit.
PCnDDR
Pin function
[Legend] n = 7, 6
• PC5/SDA4
The pin function is switched as shown below according to the combination of the ICE bit in
ICCR of the IIC_4 and the PC5DDR bit.
ICE
PC5DDR
Pin function
[Legend] X: Don't care.
Rev. 1.00 Mar. 12, 2008 Page 254 of 1178
REJ09B0403-0100
0
PCn input pin
0
0
PC5 input pin
1
PC5 output pin
1
PCn output pin
1
X
SDA4 input/output pin
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