h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 256

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 9 I/O Ports
9.12
Port F is a 7-bit I/O port. Port F also functions as LCD driver output pins, external interrupt input
pins, the A/D trigger input pin, bus control signal I/O pins, and as the system clock output pin.
• Port F data direction register (PFDDR)
• Port F data register (PFDR)
• Port F register (PORTF)
9.12.1
PFDDR is an 8-bit write-only register, the individual bits of which specify input or output for the
pins of port F. PFDDR cannot be read; if it is, an undefined value will be read.
Note:
Rev. 2.00 Dec. 05, 2005 Page 218 of 724
REJ09B0200-0200
Bit
7
6
5
4
3
2
1
0
*
Port F
Port F Data Direction Register (PFDDR)
Bit Name
PF7DDR
PF6DDR
PF5DDR
PF4DDR
PF3DDR
PF2DDR

PF0DDR
The initial value is 0 in mode 7.
Initial
Value
1*
0
0
0
0
0
Undefined 
0
R/W
W
W
W
W
W
W
W
Description
Setting a PFDDR bit to 1 makes the PF7 pin a φ output
pin, while clearing the bit to 0 makes the pin an input
pin.
Setting a PFDDR bit to 1 makes the corresponding port
F pin an output port, while clearing the bit to 0 makes
the pin an input port.
Reserved
Setting a PFDDR bit to 1 makes the corresponding port
F pin an output port, while clearing the bit to 0 makes
the pin an input port.