Jameco Electronics 3000 사용자 설명서

The programming port provides a standard physical and electrical interface between a 
Rabbit-based system and the Dynamic C programming platform. A special interface cable 
and converter connects a PC serial port to the programming port. The programming port is 
implemented by means of a 10-pin standard 2 mm connector. (Of course the user can 
change the physical implementation of the connector if he so desires.)  With this setup the 
PC can communicate with the target, reset it and reboot it. The DTR line on the PC serial 
interface is used to drive the target reset line, which should be drivable by an external 
CMOS driver. The STATUS pin is used to by the Rabbit-based target to request attention 
when a breakpoint is encountered in the target under test. The SMODE pins are pulled up 
by a +5 V/+3 V level from the interface. They should be pulled down on the board when 
the interface is not in use by approximately 5 k

Ω resistors to ground. The target under test 

provides the +5 V or +3 V to the interface cable which is used to power the RS-232 driver 
and receiver.

10

1

2

3

4

5

6

7

8

9

PROGRAMMING PORT PIN ASSIGNMENTS

(Rabbit LQFP pins are shown in parenthesis)

  1.  RXA (66)

  2.  GND

  3.  CKLKA (117)

  4.  +5 V/+3 V

  5.  /RESET

  6.  TXA (67)

  7.  n.c.

  8.  STATUS (output) (4)
  9.  SMODE0 (45)
10.  SMODE1 (44)

~50 kW

GND

~50 kW

+

~50 kW

GND

~50 kW

+

~10 kW

+