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Rabbit 6000 User’s Manual
digi.com
153
15. P
ARALLEL
P
ORT
H
15.1 Overview
Parallel Port H 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 H Data Register (PHDR).
All of the Parallel Port H pins have alternate output functions. Parallel Port H has no alternate input func-
tionality.
When used as outputs, the Parallel Port H bits are buffered, with the data written to PHDR transferred to
the output pins. Each bit can either be programmed as open-drain or driven high and low.
Parallel Port H acts as the upper byte of the external I/O bus when the 16-bit mode is enabled; all other
Parallel Port H functionality will be disabled automatically when that mode is in effect.
The drive strength and slew rate can be individually controlled for each Parallel Port H 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 15-1. Parallel Port H Pin Alternate Output Functions
Pin Name
Alt Out 1
Alt Out 2
Alt Out 3
16-bit
I/O Bus
PH7
I7
PWM3
SCLKC
D15
PH6
I6
PWM2
TXE
D14
PH5
I5
PWM1
RCLKE
D13
PH4
I4
PWM0
TCLKE
D12
PH3
I3
TIMER C3
SCLKD
D11
PH2
I2
TIMER C2
TXF
D10
PH1
I1
TIMER C1
RCLKF
D9
PH0
I0
TIMER C0
TCLKF
D8
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