User`s manual

8 RabbitCore 2000
The ports on the Rabbit 2000 microprocessor used in the RabbitCore 2000 are config-
urable, and so the factory defaults can be reconfigured. Table 2 lists the Rabbit 2000 fac-
tory defaults and the alternate configurations.
Table 2. RabbitCore 2000 Pinout Configurations
Pin Pin Name Default Use Alternate Use Notes
Header J1
1, 20 GND
2VCC
3–10 PA[0:7] Parallel I/O
Slave port data bus
SD0–SD7
11 PB0 Input Serial port clock CLKB
12 PB1 Input Serial port clock CLKA
CLKA is connected to
programming port (header
J3, pin 3)
13 PB2 Input Slave port write /SWR
14 PB3 Input Slave port read /SRD
15 PB4 Input SA0
Slave port address lines
16 PB5 Input SA1
17 PB6 Output
18 PB7 Output
Slave port attention line
/SLAVEATTN
19 PCLK Output (Internal Clock) Output Disable by removing R27
21–28 D[7:0] Input/Output Rabbit 2000 data bus
29 PE7
Bitwise or parallel
programmable I/O
I7 output or slave port chip
select /SCS
30 PE6 I6 output
31 PE5 I5 output or INT1B input
32 PE4 I4 output or INT0B input
33 PE3 I3 output
34 PE2 I2 output
35 PE1 I1 output or INT1A input
36 PE0 I0 output or INT0A input
37 /IOWR Output (I/O write strobe)
38 /IORD Output (I/O read strobe)
39 /BUFEN Output (I/O buffer enable)
40 /WDO Output (Watchdog output)
May also be used to output
a 30 µs pulse
Outputs a pulse when
the internal watchdog
times out