r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 682

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 10 I/O Ports
10.16
Note: Port H is not supported in the H8S/2424 Group.
Port H is a 4-bit I/O port that also has other functions. Port H has the following registers. For the
port function control registers, refer to section 10.18, Port Function Control Registers.
• Port H data direction register (PHDDR)
• Port H data register (PHDR)
• Port H register (PORTH)
• Port function control register 0 (PFCR0)
• Port function control register 2 (PFCR2)
• Port H open drain control register (PHODR)
10.16.1 Port H Data Direction Register (PHDDR)
The individual bits of PHDDR specify input or output for the pins of port H. PHDDR cannot be
read; if it is, an undefined value will be read.
Rev. 1.00 Sep. 19, 2008 Page 654 of 1270
REJ09B0466-0100
Bit
7 to 4
3
2
1
0
Bit Name

PH3DDR
PH2DDR
PH1DDR
PH0DDR
Port H
All 0
0
0
0
0
Initial Value
R/W

W
W
W
W
Description
Reserved
•
Modes 7 (when EXPE = 1), 1, 2, and 4
When the OE output enable bit (OEE) and OE
output select bit (OES) are set to 1, pin PH3
functions as the OE output pin. Otherwise, when
bit CS7E is set to 1, pin PH3 functions as the CS7
output pin when bit PH3DDR is set to 1, and as an
input port when the bit is cleared to 0. When bit
CS7E is cleared to 0, pin PH3 is an I/O port, and
its function can be switched with bit PH3DDR.
When areas 2 to 5 are specified as continuous
SDRAM space*, OE output is CKE output.
When bit CS6E is set to 1, setting bit PH2DDR to
1 makes pin PH2 function as the CS6 output pin,
and clearing the bit to 0 makes the pin function as
an I/O port. When bit CS6E is cleared to 0, pin
PH2 is an I/O port, and its function can be
switched with bit PH2DDR.