Port C; Port C Data Direction Register (Pcddr) - Renesas H8S/2368 Series Hardware Manual

9.10

Port C

Port C is an 8-bit I/O port that also has other functions. The port C has the following registers.

• Port C data direction register (PCDDR)

• Port C data register (PCDR)
• Port C register (PORTC)
• Port C MOS pull-up control register (PCPCR)
9.10.1 Port C Data Direction Register (PCDDR)
The individual bits of PCDDR specify input or output for the pins of port C.
PCDDR cannot be read; if it is, an undefined value will be read.
Bit Bit Name Initial Value
7 PC7DDR 0
6 PC6DDR 0
5 PC5DDR 0
4 PC4DDR 0
3 PC3DDR 0
2 PC2DDR 0
1 PC1DDR 0
0 PC0DDR 0
Rev. 2.00, 05/03, page 352 of 820
R/W Description
•
W
Modes 1 and 2
Port C pins are address outputs regardless of the
W
PCDDR settings.
W
•
Modes 4 and 7 (when EXPE = 1)
W
Setting a PCDDR bit to 1 makes the corresponding
W
port C pin an address output, while clearing the bit to
W
0 makes the pin an input port.
•
W
Mode 7 (when EXPE = 0)
Port C is an I/O port, and its pin functions can be
W
switched with PCDDR.