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3.3 Programming Cable
The programming cable is used to connect the programming port of the Smart Star CPU
Card to a PC serial COM port. The programming cable converts the RS-232 voltage levels
used by the PC serial port to the TTL voltage levels used by the Rabbit 2000.
When the PROG connector on the programming cable is connected to the CPU Card’s
programming header, programs can be downloaded and debugged over the serial interface.
The DIAG connector of the programming cable may be used on the CPU Card’s program-
ming header with the Smart Star operating in the Run Mode. This allows the programming
port to be used as a regular serial port.
3.3.1 Changing Between Program Mode and Run Mode
The Smart Star is automatically in Program Mode when the PROG connector on the pro-
gramming cable is attached to the CPU Card, and is automatically in Run Mode when no
programming cable is attached. When the Rabbit 2000 is reset, the operating mode is deter-
mined by the status of the SMODE pins. When the programming cable’s PROG connector
is attached, the SMODE pins are pulled high, placing the Rabbit 2000 in the Program
Mode. When the programming cable’s PROG connector is not attached, the SMODE pins
are pulled low, causing the Rabbit 2000 to operate in the Run Mode.
Program Mode
Run Mode
DIAG
Diagnostic
connector
Red
shrink wrap
To
PC COM port
Colored side
towards pin 1
PROG
Programming
connector
Pin 1
J3
C19
C23
C24
C25
U10 C27
J3
C19
C23
C24
C25
U10 C27
C28
C28
U6
C26
J7
U6
C26
J7
J6
J6
R5
Y1
R17
C18
J4
C35
C46
C49
R5
Y1
R17
C18
J4
C35
C46
C49
C4
C7
R11
R12
C11
J4
C4
C7
R11
R12
C11
J4
R2
U8
C53
R2
U8
C53
RP4
RP4
C1
C2
C15
U14
C1
C2
C15
U14
U1
C21
U9
C31
C36
C41
J8
U1
C21
U9
C31
C36
C41
J8
Y3
Y3
RT1
R4
C3
R1
R3
U3
C16
J5
J5
C32
C33
D3
D5
RT1
R4
C3
R1
R3
U3
C16
J5
J5
C32
C33
D3
D5
D1
D2
Y2
C10
R13
C13
R21
R23
Q1
R26
Q3
BT1
R42
Battery
D1
D2
Y2
C10
R13
C13
R21
R23
Q1
R26
Q3
BT1
R42
Battery
RESET Smart Star when changing mode:
Cycle power off/on
after removing or attaching programming cable.
Figure 15. Smart Star Program Mode and Run Mode Set-Up
A program “runs” in either mode, but can only be downloaded and debugged when the
Smart Star is in the Program Mode.
Refer to the Rabbit 2000 Microprocessor User ’s Manual for more information on the pro-
gramming port and the programming cable.
User ’s Manual
37
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