HD64F3664BPV Datasheet, PDF (152/446 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 9 I/O Ports
9.2.2 Port Data Register 2 (PDR2)
PDR2 is a general I/O port data register of port 2.
Initial
Bit
Bit Name Value R/W Description
7

1

Reserved
6

1

These bits are always read as 1.
5

1

4

1

3

1

2
P22
0
R/W PDR2 stores output data for port 2 pins.
1
P21
0
0
P20
0
R/W PDR2 is read while PCR2 bits are set to 1, the value
R/W ^{stored in PDR2 is read. If PDR2 is read while PCR2 bits}
are cleared to 0, the pin states are read regardless of
the value stored in PDR2.
9.2.3 Pin Functions
The correspondence between the register specification and the port functions is shown below.
• P22/TXD Pin
Register
PMR1
Bit Name TXD
Setting Value 0
1
[Legend]
X: Don't care.
PCR2
PCR22
0
1
X
Pin Function
P22 input pin
P22 output pin
TXD output pin
Rev. 6.00 Mar. 24, 2006 Page 122 of 412
REJ09B0142-0600