Overview; Register Configuration And Description; Port E - Hitachi H8/3637 Hardware Manual

8.11

Port E

8.11.1

Overview

Port E is a 2-bit I/O port, configured as shown in figure 8.10.
8.11.2

Register Configuration and Description

Table 8.27 shows the port E register configuration.
Table 8.27 Port E Registers
Name
Port data register E
Port control register E
Port Data Register E (PDRE)
Bit
Initial value
Read/Write
PDRE is a 2-bit register that stores data for port E pins PE
bits are set to 1, the values stored in PDRE are directly read, regardless of the actual pin states. If
port E is read while PCRE bits are cleared to 0, the pin states are read.
Upon reset, PDRE is initialized to H'F0.
156
Port E
Figure 8.10 Port E Pin Configuration
Abbrev.
PDRE
PCRE
7 6
— — —
1 1
— — —
PE
PE
R/W
R/W
W
5 4
— PE
1 1
— R/W
and PE
3
3
2
Initial Value Address
H'F0 H'FFD3
H'F0 H'FFE3
3 2
PE —
3 2
0 0
R/W —
. If port E is read while PCRE
2
1 0
—
0 0
—