Port 4; Overview; Register Configuration And Description - Renesas H8 Series Hardware Manual

8.4

Port 4

8.4.1

Overview

Port 4 is a 3-bit I/O port and 1-bit input port, configured as shown in figure 8.3.
8.4.2

Register Configuration and Description

Table 8.8 shows the port 4 register configuration.
Table 8.8 Port 4 Registers
Name
Port data register 4
Port control register 4
Port mode register 2
Port Data Register 4 (PDR4)
Bit 7
—
Initial value 1
Read/Write —
PDR4 is an 8-bit register that stores data for port 4 pins P4
bits are set to 1, the values stored in PDR4 are read, regardless of the actual pin states. If port 4 is
read while PCR4 bits are cleared to 0, the pin states are read.
Upon reset, PDR4 is initialized to H'F8.
Port 4
Figure 8.3 Port 4 Pin Configuration
Abbr.
PDR4
PCR4
PMR2
6 5 4
— — —
1 1 1
— — —
P4 /IRQ
3
0
P4 /TXD
2
32
P4 /RXD
1 32
P4 /SCK
0 32
R/W Initial Value
R/W H'F8
W H'F8
R/W H'D8
3 2
P4 P4
3 2
1 0
R R/W
to P4 . If port 4 is read while PCR4
2 0
Rev. 7.00 Mar 10, 2005 page 209 of 652
Section 8 I/O Ports
Address
H'FFD7
H'FFE7
H'FFC9
1 0
P4 P4
1 0
0 0
R/W R/W
REJ09B0042-0700