Rabbit 6000 User’s Manual
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145
14. P
ARALLEL
P
ORT
G
14.1 Overview
Parallel Port G is a byte-wide port with each bit programmable for data direction and drive level. These are
simple inputs and outputs controlled and reported in the Port G Data Register (PGDR).
All of the Parallel Port G pins have alternate output functions, and all of them can be used as inputs to var-
ious on-chip peripherals.
When used as outputs, the Parallel Port G bits are buffered, with the data written to PGDR transferred to
the output pins on a selected timing edge. Either the peripheral clock or the outputs of Timer A1, Timer
B1, or Timer B2 can be used for this function, with each nibble of the port having a separate select field to
control this timing. Each bit can either be programmed as open-drain or driven high and low.
The drive strength and slew rate can be individually controlled for each Parallel Port G pin. In addition, a
75 k
pullup or pulldown resistor can be enabled on each pin.
Note that it is possible for either Flexible Interface Module to use any of the parallel ports. See Chapter 33
for more information.
Table 14-1. Parallel Port G Pin Alternate Output Functions
Pin Name
Alt Out 0
Alt Out 1
Alt Out 2
Alt Out 3
PG7
FIMB7
I7
PWM3
SCLKC
PG6
FIMB6
I6
PWM2
TXE
PG5
FIMB5
I5
PWM1
RCLKE
PG4
FIMB4
I4
PWM0
TCLKE
PG3
FIMB3
I3
TIMER C3
SCLKD
PG2
FIMB2
I2
TIMER C2
TXF
PG1
FIMB1
I1
TIMER C1
RCLKF
PG0
FIMB0
I0
TIMER C0
TCLKF
Содержание 6000
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