Renesas H8/38342, Hardware Manual

Page: 252 / 721

Section 8 I/O Ports
Rev. 6.00 Aug 04, 2006 page 214 of 680
REJ09B0145-0600
1. Port Data Register 2 (PDR2)
Bit
Initial value
Read/Write
7
P2
7
0
R/W
6
P2
6
0
R/W
5
P2
5
0
R/W
4
P2
4
0
R/W
3
P2
3
0
R/W
0
P2
0
0
R/W
2
P2
2
0
R/W
1
P2
1
0
R/W
PDR2 is an 8-bit register that stores data for port 2 pins P2
7
to P2
0
. If port 2 is read while PCR2
bits are set to 1, the values stored in PDR2 are read, regardless of the actual pin states. If port 2 is
read while PCR2 bits are cleared to 0, the pin states are read.
Upon reset, PDR2 is initialized to H'00.
2. Port Control Register 2 (PCR2)
Bit
Initial value
Read/Write
7
PCR2
7
0
W
6
PCR2
6
0
W
5
PCR2
5
0
W
4
PCR2
4
0
W
3
PCR2
3
0
W
0
PCR2
0
0
W
2
PCR2
2
0
W
1
PCR2
1
0
W
PCR2 is an 8-bit register for controlling whether each of the port 2 pins P2
7
to P2
0
functions as an
input pin or output pin. Setting a PCR2 bit to 1 makes the corresponding pin an output pin, while
clearing the bit to 0 makes the pin an input pin. The settings in PCR2 and PDR2 are valid only
when the corresponding pin is designated in PMR1 as a general I/O pin.
Upon reset, PCR2 is initialized to H'00.
PCR2 is a write-only register, which is always read as all 1s.
3. Port Mode Register 2 (PMR2)
•
H8/3847R Group, H8/3847S Group
Bit
Initial value
Read/Write
7
—
1
—
6
—
1
—
5
POF1
0
R/W
4
—
1
—
3
—
1
—
0
SCK1
0
R/W
2
SO1
0
R/W
1
SI1
0
R/W
PMR2 is an 8-bit read/write register that controls the selection of pin functions for port 2 pins P2
0
,
P2
1
, and P2
3
, and the PMOS on/off state for the P2
2
/SO
1
pin.
Upon reset, PMR2 is initialized to H'D8.