Digi BL1800 user manual Programming Cable, Changing Between Program Mode and Run Mode

3.6 Programming Cable

The programming cable is used to connect the Jackrabbit’s programming port 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 Jackrabbit’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 Jackrabbit’s program- ming header with the Jackrabbit operating in the Run Mode. This allows the programming port to be used as a regular serial port.

3.6.1 Changing Between Program Mode and Run Mode

The Jackrabbit is automatically in Program Mode when the PROG connector on the pro- gramming cable is attached to the Jackrabbit, and is automatically in Run Mode when no programming cable is attached. When the Rabbit 2000 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 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

Power

U1

GND	J1
	J2
GND

	J4
GND	VCC
PA0	PA1
PA2	PA3
PA4	PA5
PA6	PA7	U3
GND	GND
PB0	PB1
PB2	PB3
PB4	PB5	Rabbit 2000
PB6	PB7
WDO	PCLK
GND	PE7
PE6	PE5
PE4	PE3
PE2	PE1
PE0	GND
HV0	HV1
HV2	HV3
K	+RAW
GND	VCC	Y3

U4
RS-232		J5
JP1	VCC	GND
	RXB	RXC
U5	TXB	TXC
	PC0	PC1
	PC2	PC3
SRAM	PC4	PC5
	PC6	PC7
	AD0	AGND
	DA0	DA1
	PD0	PD1
	PD2	PD3
	PD4	PD5
	PD6	PD7
	GND	GND
	485–	485+
U6	VCC	VCC
	SM0	SM1
	IOBEN	STAT
RS-485	GND	VBAT
	/RST	GND
		RESET

U1

GND	J1
	J2
GND

	J4
GND	VCC
PA0	PA1
PA2	PA3
PA4	PA5
PA6	PA7	U3
GND	GND
PB0	PB1
PB2	PB3
PB4	PB5	Rabbit 2000
PB6	PB7
WDO	PCLK
GND	PE7
PE6	PE5
PE4	PE3
PE2	PE1
PE0	GND
HV0	HV1
HV2	HV3
K	+RAW
GND	VCC	Y3

U4
RS-232		J5
JP1	VCC	GND
	RXB	RXC
U5	TXB	TXC
	PC0	PC1
	PC2	PC3
SRAM	PC4	PC5
	PC6	PC7
	AD0	AGND
	DA0	DA1
	PD0	PD1
	PD2	PD3
	PD4	PD5
	PD6	PD7
	GND	GND
	485–	485+
U6	VCC	VCC
	SM0	SM1
	IOBEN	STAT
RS-485	GND	VBAT
	/RST	GND
		RESET

Colored side lines up with pin 1

J3			J3
	JACKRABBIT Z-World, Inc.			JACKRABBIT Z-World, Inc.
	Programming	Reset pads		Reset pads
PROG
	connector		RESET Jackrabbit board when changing mode:
			Short out RESET pads below header J5, OR
			Press RESET button (if using Prototyping Board), OR
DIAG	To		Cycle power off/on
			after removing or attaching programming cable.
	PC COM port

Figure 13. Jackrabbit Program Mode and Run Mode Setup

A program “runs” in either mode, but can only be downloaded and debugged when the Jackrabbit 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.

32 Jackrabbit (BL1800)