Port 2; Overview; Register Configuration And Description; Port Data Register 2 (Pdr2) - Hitachi H8/3664 Hardware Manual

9.3

Port 2

9.3.1

Overview

Port 2 is a 3-bit I/O port, configured as shown in figure 9.2.
9.3.2

Register Configuration and Description

Table 9.3 shows the port 2 register configuration.
Table 9.3 Port 2 Registers
Name
Port data register 2
Port control register 2
9.3.3

Port Data Register 2 (PDR2)

Bit 7
—
Initial value 1*
Read/Write —
Note: * Bits 7 to 3 are reserved; they are always read as 1 and cannot be modified.
PDR2 is an 8-bit register that stores data for port 2 pins P22 to P20. 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'F8.
146
Port 2
Figure 9.2 Port 2 Pin Configuration
Abbrev.
PDR2
PCR2
6 5
— —
1* 1*
— —
P22/TXD
P21/RXD
P20/SCK3
R/W Initial Value
R/W H'F8
W H'00
4 3
— —
1* 1*
— —
Address
H'FFD5
H'FFE5
2 1
P22 P21
0 0
R/W R/W
0
P20
0
R/W