Datasheet

Section 9 I/O Ports
Page 274 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
9.11 Port F
Port F is an 8-bit I/O port that also has external interrupt input (IRQ2, IRQ3), bus control sign I/O,
system clock output. The port F has the following registers.
• Port F data direction register (PFDDR)
• Port F data register (PFDR)
• Port F register (PORTF)
9.11.1 Port F Data Direction Register (PFDDR)
The individual bits of PFDDR specify input or output for the pins of port F. Since this is a write-
only register, bit manipulation instructions should not be used to write to it. For details, see section
2.9.4, Accessing Registers Containing Write-Only Bits.
Bit Bit Name Initial Value R/W Description
7 PF7DDR 1/0
*
W
6 PF6DDR 0 W
5 PF5DDR 0 W
4 PF4DDR 0 W
3 PF3DDR 0 W
2 PF2DDR 0 W
1 PF1DDR 0 W
0 PF0DDR 0 W
Modes 4 to 6
Pin PF7 functions as the φ output pin when the
corresponding PFDDR bit is set to 1, and as an input port
when the bit is cleared to 0. The input/output direction
specification in PFDDR is ignored for pins PF6 to PF3,
which are automatically designated as bus control
outputs. Pins PF2 to PF0 are made bus control
input/output pins by bus controller settings. Otherwise,
setting a PFDDR bit to 1 makes the corresponding pin an
output port, while clearing the bit to 0 makes the pin an
input port.
Mode 7
Setting a PFDDR bit to 1 makes the corresponding port F
pin PF6 to PF0 an output port, or in the case of pin PF7,
the φ output pin. Clearing the bit to 0 makes the pin an
input port.
Note: * In modes 4 to 6, set to 1; in mode 7 cleared to 0.