Port Data Register 2(Pdr2); Pin Functions - Hitachi H8/3672 Series Hardware Manual

9.2.2

Port Data Register 2(PDR2)

PDR2 is a general I/O port data register of port 2.
Bit Bit Name Initial Value R/W
−
7 1
−
6 1
−
5 1
−
4 1
−
3 1
2 P22 0
1 P21 0
0 P20 0
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
0
1
Legend X:Don't care.
P21/RXD pin
Register SCR3
Bit Name RE
Setting Value 0
0
1
Legend X:Don't care.
Description
−
Reserved
−
These bits are always read as 1 and cannot be modified.
−
−
−
R/W PDR2 stores output data for port 2 pins.
R/W 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
R/W
cleared to 0, the pin states are read regardless of the value
stored in PDR2.
PCR2
PCR22 Pin Function
0 P22 input pin
1 P22 output pin
X TXD output pin
PCR2
PCR21 Pin Function
0 P21 input pin
1 P21 output pin
X RXD input pin
Rev. 1.0, 03/01, page 95 of 280