Datasheet

Section 10 I/O Ports
Rev. 3.00 Mar 17, 2006 page 506 of 926
REJ09B0283-0300
10.14.3 Port F Register (PORTF)
PORTF shows port F pin states.
PORTF cannot be modified.
Bit Bit Name Initial Value R/W Description
7 PF7 Undefined
*
R
6 PF6 Undefined
*
R
5 PF5 Undefined
*
R
4 PF4 Undefined
*
R
3 PF3 Undefined
*
R
2 PF2 Undefined
*
R
1 PF1 Undefined
*
R
0 PF0 Undefined
*
R
If a port F read is performed while PFDDR bits are
set to 1, the PFDR values are read. If a port F read
is performed while PFDDR bits are cleared to 0, the
pin states are read.
Note: * Determined by the states of pins PF7 to PF0.
10.14.4 Pin Functions
Port F pins also function as external interrupt inputs, bus control signal I/Os, and system clock
outputs (φ). The correspondence between the register specification and the pin functions is shown
below.
• PF7/φ
The pin function is switched as shown below according to bit PF7DDR.
Operating
mode
1 to 7
PFDDR 0 1
Pin function PF7 input φ output