M68HC16 Z SERIES
REGISTER SUMMARY
USER’S MANUAL
D-11
sponding port is configured as an output, the value stored for that bit is driven out on
the pin. A read of this data register returns the value at the pin only if the pin is config-
ured as a discrete input. Otherwise, the value read is the value stored in the register.
Bits [15:8] are unimplemented and will always read zero.
D.2.10 Port F Data Direction Register
This register controls the direction of the port F pin drivers when pins are configured
for I/O. Setting a bit configures the corresponding pin as an output; clearing a bit con-
figures the corresponding pin as an input. This register can be read or written at any
time. Bits [15:8] are unimplemented and will always read zero.
D.2.11 Port F Pin Assignment Register
This register determines the function of port F pins. Setting a bit assigns the corre-
sponding pin to a control signal; clearing a bit assigns the pin to port F. Bits [15:8] are
unimplemented and will always read zero. Refer to
DDRF — Port F Data Direction Register
$YFFA1C
15
8
7
6
5
4
3
2
1
0
NOT USED
DDF7
DDF6
DDF5
DDF4
DDF3
DDF2
DDF1
DDF0
RESET:
0
0
0
0
0
0
0
0
PFPAR — Port F Pin Assignment Register
$YFFA1E
15
8
7
6
5
4
3
2
1
0
NOT USED
PFPA7
PFPA6
PFPA5
PFPA4
PFPA3
PFPA2
PFPA1
PFPA0
RESET:
DATA9
DATA9
DATA9
DATA9
DATA9
DATA9
DATA9
DATA9
Table D-5 Port F Pin Assignments
PFPAR Field
Port F Signal
Alternate Signal
PFPA7
PF7
IRQ7
PFPA6
PF6
IRQ6
PFPA5
PF5
IRQ5
PFPA4
PF4
IRQ4
PFPA3
PF3
IRQ3
PFPA2
PF2
IRQ2
PFPA1
PF1
IRQ1
PFPA0
PF0
MODCLK
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Freescale Semiconductor, Inc.
For More Information On This Product,
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