Rabbit 6000 User’s Manual
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139
13.1.2 Registers
13.2 Dependencies
13.2.1 I/O Pins
Parallel Port F uses the pins PF0 through PF7. These pins can be used individually as data inputs or out-
puts; serial port signals, PWM or Timer C outputs, external interrupt, external I/O strobes, or inputs and out-
puts for Flexible Interface Module A.
All pins are set as inputs on startup.
The individual bits can be set to be open-drain via PFDCR. Drive strength, slew rate, and the pullup/down
resistor status are selectable via PFxCR.
See the associated peripheral chapters for details on how they use Parallel Port F.
13.2.2 Clocks
All outputs on Parallel Port F are clocked by the peripheral clock unless changed in PFCR, where the
option of updating the Parallel Port F pins can be synchronized to the output of Timer A1, Timer B1, or
Timer B2.
13.2.3 Other Registers
Register Name
Mnemonic
I/O Address
R/W
Reset
Port F Data Register
PFDR
0x0038
R/W
xxxxxxxx
Port F Alternate Low Register
PFALR
0x003A
R/W
00000000
Port F Alternate High Register
PFAHR
0x003B
R/W
00000000
Port F Control Register
PFCR
0x003C
R/W
xx00xx00
Port F Function Register
PFFR
0x003D
R/W
00000000
Port F Drive Control Register
PFDCR
0x003E
R/W
00000000
Port F Data Direction Register
PFDDR
0x003F
R/W
00000000
Port Fx Control Register
PFxCR
x
W
xxx00000
Register
Function
I2CR, I3CR, I4CR,
I5CR, I6CR, I7CR
Select a Parallel Port F pin as an external
interrupt input.
Summary of Contents for 6000
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