Rabbit RabbitCore RCM4000 User Manual - page 39

User’s Manual

33

4.3  Programming Cable

The programming cable is used to connect the programming port of the RCM4000 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 4000.

When the 

PROG

 connector on the programming cable is connected to the programming 

port on the RCM4000, programs can be downloaded and debugged over the serial interface. 

The 

DIAG

 connector of the programming cable may be used on header J1 of the RCM4000 

with the RCM4000 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 RCM4000 is automatically in Program Mode when the 

PROG

 connector on the pro-

gramming cable is attached, and is automatically in Run Mode when no programming 

cable is attached. When the Rabbit 4000 is reset, the operating mode is determined 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 4000 in the Program Mode. When the 

programming cable’s 

PROG

 connector is not attached, the SMODE pins are pulled low, 

causing the Rabbit 4000 to operate in the Run Mode. 

Figure 9.  Switching Between Program Mode and Run Mode

D1

R1

PWR

DS1

GND

J1

U1

C1

GND

C2

JP1

C3

D2

JP2

C4

+3.3 V

J2

R2

BT1

1

S1

RESET

RXD 

TXD

TXC  RXC

GND

J4

UX29

RX81

RX87

CX41

RX83

RX11

CX39

UX30

UX10

UX12

UX14

UX16

RX79

CX29

CX17

RX67

UX45

RX85

GND

GND

GND

1

R24

R22

R21

R23

CX23 RX77

1

R27 R28

JP25

CX25

RX75

RX73

CX27

DS3

S3

S2

DS2

J3

UX49

UX4

UX47

+5 V

GND

+3.3 V

RCM1

U2

/RST_OUT

/IOWR

VBAT

EXT

PA1

PA3

PA5

PA7

PB1

PB3

PB5

PB7

PC1

PC3

PC5

PC7

PE1

PE3

PE5

PE7

PD1

LN1

PD3

LN3

PD5

LN5

PD7

LN7

VREF

GND

/IORD

/RST_IN

PA0

PA2

PA4

PA6

PB0

PB2

PB4

PB6

PC0

PC2

PC4

PC6

PE0

PE2

PE4

PE6

PD0

LN0

PD2

LN2

PD4

LN4

PD6

LN6

CVT

AGND

JP24

JP23

C14

C12

C10

C8

C7

C9

C1

1

C13

R10

R8

R6

R4

R3

R5

R7

R20

R18

R16

R14

R13

R15

R17

R29

JP1

1

JP15

JP19

JP21

JP22 JP20

JP17

JP13

R19

R9

RX57

RX55

RX97

RX49

UX33

UX31

RX89

UX3

UX37

UX42

UX41

RX63

RX65

RX61

RX59

R26

R25

Q1

C15

C19

C20 U3

C18

C17

JP16

JP6

JP5

JP12

JP4

JP3

JP14

JP8

JP7

JP18

JP9

JP10

C16

L1C6

C5

AGND

CVT

LN6IN

LN4IN

LN2IN

LN0IN

VREF

LN7IN

LN5IN

LN3IN

LN1IN

AGND

AGND

R1

1

R12

RX47

RX43

R34

C8

C7

C9

C12

C14

L6

L7

C15

C1

1

L5

L4

R20

J2

C41

R35

DS1

DS2

R37

R36

ACT

LINK

C72

Y3

C71

U17

C66

R46

U18

R47

C53

C54

C52

C51

C50 C49

C47

C48

U7

C42

C43

U6

C34

C35

Y1

U5

R25

C33

R24

C20

Q1

T1

C18

L3

R7

R6

L2

C16

C13

L9

L8

R5

R4

R3

R1

R2

R8

R51

C10

U1

R9

R10

JP1

JP3

JP2

U3

C22

C23

RP2

R43

D1

R27

R28

JP4

R33 R32

R31

Y2

R48 C55

C56 C46 C45C44

U9

R30

C38

U8

C36

R26

C32

C30

C31

R29

C29

C28

C26

C27

C24

C25

J1

RESET

3-pin

power connector

J1

Colored

edge

To

PC 

COM

 port

Blue

shrink wrap

PROG

DIAG

Programming

Cable

PROG

J1

RESET RCM4000 when changing mode:

 Press RESET button (if using Prototyping Board), 

OR

 Remove, then reapply power

after removing or attaching programming cable.