Selected signals from the Rabbit 4000 microprocessor are available on header J2 of the Prototyping Board. The remaining ports on the Rabbit 4000 microprocessor are used for RS-232 serial communication. Table B-2lists the signals on header J2 and explains how they are used on the Prototyping Board.

Table B-2. Use of Rabbit 4000 Signals on the Prototyping Board

Pin

Pin Name

Prototyping Board Use

1

+3.3 V

+3.3 V power supply

 

 

 

2

GND

 

 

 

 

3

/RST_OUT

Reset output from reset generator

 

 

 

4

/IORD

External read strobe

 

 

 

5

/IOWR

External write strobe

 

 

 

6

/RESET_IN

Input to reset generator

 

 

 

8–15

PA0–PA7

Output, pulled high

 

 

 

16

PB0

CLKB (used by A/D converter RCM4000 only)

 

 

 

17

PB1

Programming port CLKA

 

 

 

18

PB2

LED DS2 (normally high/off)

 

 

 

19

PB3

LED DS3 (normally high/off)

 

 

 

20

PB4

Switch S2 (normally open/pulled up)

 

 

 

21

PB5

Switch S3 (normally open/pulled up)

 

 

 

22–23

PB6–PB7

Output, pulled high

 

 

 

24–25

PC0–PC1

Serial Port D (RS-232, header J4) (high)

 

 

 

26–27

PC2–PC3

Serial Port C (RS-232, header J4) (high)

 

 

 

28–29

PC4–PC5

Serial Port B (used by A/D converter RCM4000 only)

 

 

 

30–31

PC6–PC7

Serial Port A (programming port) (high)

 

 

 

32–39

PE0–PE7

Parallel I/O, Output, I0–I7

 

 

 

40–47

LN0–LN7

A/D converter inputs (RCM4000 only)

 

 

PD0–PD7

Output, pulled high

 

 

 

 

48

CONVERT

A/D converter CONVERT input (RCM4000 only)

 

 

 

49

VREF

A/D converter reference voltage (RCM4000 only)

 

 

 

50

AGND

A/D converter ground (RCM4000 only)

 

 

 

There is a 1.3" × 2" through-hole prototyping space available on the Prototyping Board. The holes in the prototyping area are spaced at 0.1" (2.5 mm). +3.3 V, +5 V, and GND traces run along the top edge of the prototyping area for easy access. Small to medium circuits can be prototyped using point-to-point wiring with 20 to 30 AWG wire between the proto- typing area, the +3.3 V, +5 V, and GND traces, and the surrounding area where surface- mount components may be installed. Small holes are provided around the surface-mounted components that may be installed around the prototyping area.

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RabbitCore RCM4000

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Digi RCM4000 user manual Pin Pin Name Prototyping Board Use