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4.3 Serial Programming Cable
The programming cable is used to connect the programming port of the RCM3750 to a PC
serial COM port. The programming cable converts the RS-232 voltage levels used by the
PC serial port to the CMOS voltage levels used by the Rabbit 3000.
When the
connector on the programming cable is connected to the RCM3750 pro-
PROG
gramming port, programs can be downloaded and debugged over the serial interface.
The
connector of the programming cable may be used on header J2 of the RCM3750
DIAG
with the RCM3750 operating in the Run Mode. This allows the programming port to be
used as a regular serial port.
4.3.1 Changing Between Program Mode and Run Mode
The RCM3750 is automatically in Program Mode when the
gramming cable is attached, and is automatically in Run Mode when no programming
cable is attached. When the Rabbit 3000 is reset, the operating mode is determined by the
status of the SMODE pins. When the programming cable's
the SMODE pins are pulled high, placing the Rabbit 3000 in the Program Mode. When the
programming cable's
causing the Rabbit 3000 to operate in the Run Mode.
Colored
Blue
shrink wrap
Figure 9. Switching Between Program Mode and Run Mode
30
PROG
connector is not attached, the SMODE pins are pulled low,
RESET RCM3750 when changing mode:
Press RESET button (if using Prototyping Board),
Cycle power off/on
after removing or attaching programming cable.
C1
R7
R8
J2
C2
R9
IR1
JP1
R1
J1
edge
R2
C5
R3
GND JP2
R4
C4
R5
U3
C3
R6
C7
R11
R12
R13
J5
TCM_SMT_SOCKET
R16
L2
C21
C22
R18 R19
R20
R21
C26
R22
C23
R23
C24
C25
U7
RP1
U8
JP4
R24
C27
R25
C28
JP5
JP6
JP7
R26
R27
R28
R30
R31 R32 R33 R34
R35 R36
R29
JP8
J7
C29
C35
THERMISTOR
CONVERT
R39 R40
R41 R42
DS1
J8
R45
PROG
PROG
RXC TXC RXE
C14
U1
C15
C12
C13
GND
GND
C6
/IOWR
/IORD
C16
C17
PE7
PB5
PB4
PB3
U5
U4
PB2
PA0
PA1
C11
PA3
PA5
PA6
R15
BT1
PA7
PB0
PB7
/RES
PF0
+5V
PF1
PF4
PF5
PF6
PF7
PC1/PG2
PC3/
PC0_TXD
PG3
PC2
PE5
TXC
PE4
PE1
PE0
PG7_RXE
PG6
PD4
TXE
PD5
VBAT
CX1
CX2
CX3
CX4
UX1
CX5
CX6
CX7
CX8
UX2
CX9
CX11
CX10
DS2
DS3
R47
R46
R49
RESET
S3
S1
S2
connector on the pro-
connector is attached,
OR
C19
D1
J4
D2
L1
DCIN
U2
C18
U6
R14
LCD1JA
LCD1JB
LCD1JC
RabbitCore RCM3750
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