r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 651

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

10.13
Port E is an 8-bit I/O port that also has other functions. Port E has the following registers.
• Port E data direction register (PEDDR)
• Port E data register (PEDR)
• Port E register (PORTE)
• Port E pull-up MOS control register (PEPCR)
• Port E open drain control register (PEODR)
10.13.1 Port E Data Direction Register (PEDDR)
The individual bits of PEDDR specify input or output for the pins of port E. PEDDR cannot be
read; if it is, an undefined value will be read.
Bit
7
6
5
4
3
2
1
0
Bit Name
PE7DDR
PE6DDR
PE5DDR
PE4DDR
PE3DDR
PE2DDR
PE1DDR
PE0DDR
Port E
0
0
0
0
0
0
0
0
Initial Value
R/W
W
W
W
W
W
W
W
W
Description
•
•
•
Modes 1, 2, and 4
When 8-bit bus mode is selected, port E is an I/O
port, and its pin functions can be switched with
PEDDR.
When 16-bit bus mode is selected, port E is
designated for data input/output.
For details on 8-bit and 16-bit bus modes, see
section 6, Bus Controller (BSC).
Mode 7 (when EXPE = 1)
When 8-bit bus mode is selected, port E is an I/O
port. Setting a PEDDR bit to 1 makes the
corresponding pin an output port, while clearing
a PEDDR bit to 0 makes the corresponding pin
an input port.
When 16-bit bus mode is selected, port E is
designated for data input/output.
Mode 7 (when EXPE = 0)
Port E is an I/O port, and its pin functions can be
switched with PEDDR.
Rev. 1.00 Sep. 19, 2008 Page 621 of 1342
Section 10 I/O Ports
REJ09B0467-0100