HD64F3670 RENESAS [Renesas Technology Corp], HD64F3670 Datasheet - Page 121

• Manufacturer Part Number: HD64F3670
• Description: Hitachi Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

9.2.2
PDR2 is a general I/O port data register of port 2.
Bit Bit Name
7
6
5
4
3
2
1
0
9.2.3
The correspondence between the register specification and the port functions is shown below.
P22/TXD pin
Register
Bit Name
Setting Value 0
Legend X: Don't care.
P21/RXD pin
Register
Bit Name
Setting Value 0
Legend X: Don't care.
P22
P21
P20
Port Data Register 2 (PDR2)
Pin Functions
PMR1
TXD
1
SCR3
RE
1
Initial Value R/W
1
1
1
1
1
0
0
0
PCR2
PCR22
0
1
X
PCR2
PCR21
0
1
X
R/W
R/W
R/W
Description
Reserved
These bits are always read as 1.
PDR2 stores output data for port 2 pins.
If PDR2 is read while PCR2 bits are set to 1, the value
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.
P22 input pin
P22 output pin
TXD output pin
P21 input pin
P21 output pin
RXD input pin
Pin Function
Pin Function
Rev. 2.0, 03/02, page 97 of 298