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Rabbit 6000 User’s Manual
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100
9. P
ARALLEL
P
ORT
B
9.1 Overview
Parallel Port B is a byte-wide port with each bit programmable for direction. The Parallel Port B pins are
also used to access other peripherals on the chip—the slave port, the auxiliary I/O address bus, and clock
I/O for clocked serial mode option for Serial Ports A and B. The Slave Port Control Register (SPCR) is
used to configure how Parallel Port B is used when selecting the slave port or the external I/O bus modes.
When the slave port is enabled, either under program control or during parallel bootstrap, Parallel Port B
pins carry the Slave Attention output signal, and the Slave Read strobe, Slave Write strobe, and Slave
Address inputs. The Slave Chip Select can also be programmed to come from a Parallel Port B pin.
When the external I/O bus option is enabled, either six or eight pins carry the external I/O address signals
selected in SPCR.
Two pins are used for the clocks for Serial Ports A and B when they are configured for the clocked serial
mode. These two inputs can be used as clock outputs for these ports if selected in the respective serial port
control registers. Note that when enabled, the clocked serial output overrides all other programming for the
two relevant Parallel Port B pins.
The drive strength and slew rate can be individually controlled for each Parallel Port B 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 9-1. Parallel Port B Pin Alternate Output Functions
Pin Name
Serial Ports
A–D
External I/O
Bus
PB7
—
IA5
PB6
—
IA4
PB5
—
IA3
PB4
—
IA2
PB3
—
IA1
PB2
—
IA0
PB1
SCLKA
IA7
PB0
SCLKB
IA6
Summary of Contents for 6000
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