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56
Rabbit 2000 Microprocessor
Power
VBAT
+3.0 V (battery backup), +3.3 V or +5.0 V
42
VDD
+3.3 V or +5.0 V
3, 28, 53, 78, 92
VSS
Ground
2, 27, 39, 52,
77, 89
Serial Ports
CLKA
Input/
Output
Clock for serial port A when operating in
synchronous mode. Alternate assignment
for PB1.
94
CLKB
Input/
Output
Clock for serial port B when operating in
synchronous mode. Alternate assignment
for PB0.
93
RXA, TXA,
RXB, TXB,
RXC, TXC,
RXD, TXD
RX—input
TX—output
Serial inputs and output for serial ports A–
D. These are alternate pin assignments for
parallel port C.
51, 54–60
ARXA,
ATXA,
ARXB,
ATXB
RX—input
TX—output
Alternate serial inputs and output for serial
ports A and B. These are alternate pin
assignments for parallel port D, PD4–PD7.
43–46
Slave Port
SD0-SD7
Bidirectional
Slave port data bus. An alternate
assignment for parallel port A.
81–88
/SLAVEATT
N
Output
/SLAVEATTN—Slave is requesting
attention from the master. An alternate pin
assignment for parallel port B, bit 7.
100
/SRD
Input
Strobe used to read one of the slave
registers. An alternate pin assignment for
parallel port B, bit 3.
96
/SWR
Input
Strobe used to write a slave register. An
alternate pin assignment for parallel port B,
bit 2.
95
SA0, SA1
Input
Address lines to address slave registers.
An alternate pin assignment for parallel
port B, bits 4 and 5.
97,98
/SCS
Input
Chip select for slave port, active low. An
alternate pin assignment for parallel port E,
bit 7.
21
Table 5-1. Rabbit Pin Descriptions (continued)
Pin Group
Pin Name
Direction
Function
Pin Numbers
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