
10-36
ML63326 User's Manual
Chapter 10 Ports (INPUT, OUTPUT, I/O PORT)
10.8.2 Port F Registers
(1) Port F direction register (PFDIR)
PFDIR is a 4-bit special function register (SFR) which specifies the port input/output direction
for each bit. Pins corresponding to PFDIR bits set to "0" are input, and those corresponding
to bits set to "1" are output.
At system reset the port F direction register is set to "0", and port F is initialized to input mode.
PF3DIR
PF2DIR
PF1DIR
PF0DIR
PFDIR (043H)
(R/W)
bit 3
bit 2
bit 1
bit 0
Port F input/output setting
0: Input (initial value)
1: Output
(2) Port F data register (PFD)
PFD is a 4-bit special function register used to set the output values for port F.
When the port F direction register (PFDIR) is set to "1" and the output mode is selected, the
content of the PFD is output to port F.
The port F pin levels are read when PFD is read with the port F direction register bits set to
"0" and the input mode selected.
PF3
PF2
PF1
PF0
PFD (00FH)
(R/W)
bit 3
bit 2
bit 1
bit 0
Port F output data
At system reset the port F data register is reset to "0". When data is written to the port F data
register, the pin change timing is at the rising edge of the system clock for state 2 of the write
instruction.
Figure 10-17 indicates port change timing.
S1
S2
Old data
New data
CLK
Port F
Write instruction
Figure 10-17 Port F Change Timing
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