The Rowley Associates Cross Connect JTAG Emulator is a standalone device powered from the USB cable. The JTAG Emulator does not take any power from the MSP430 target. If required the emulator can supply power at 3.3V to the MSP430 target where the current available is restricted to between 40 and 50mA.

### JTAG connector pinout

The JTAG Emulator pinout is the same as the standard MSP430 parallel port FET.

### Connecting the CrossConnect JTAG Emulator

Insert the USB connector into the PC and install the drivers. Once installed, you can connect the CrossConnector's IDC header to the target MSP430.

### Target voltage autosense

The CrossConnector has an onboard 3.3V regulator that can supply power to the target board on pin 2.

If the Enable Regulator property of the USB CrossConnect target interface is set to No, the voltage regulator is never switched on. If this property is set to Yes, then the regulator is turned on only if no voltage is detected on pin 4 of the target header. If the CrossConnect detects a voltage on pin 4, it matches its own outputs to that voltage and does not turn on the 3.3V regulator. If no target voltage is detected, then CrossConnect supplies 3.3V at 40mA to pin 2 of the target header to power the MSP430 so it can be programmed. We recommend that you always keep the Enable Regulator property set to Yes which will work with boards that are both powered locally and powered from the CrossConnect.

The CrossConnector monitors the power consumption of the target board and CrossConnect combined. If the current exceeds 100mA, the regulator is immediately shut down so that the USB bus is not overloaded. In this case, the POWER LED on the CrossConnect flashes red and yellow indicating a current overload. If this happens, your target board cannot be powered from the CrossConnect and must be powered locally.

### LED indicators

The CrossConnect has two LEDs, POWER and JTAG.

###### JTAG LED indication

The JTAG LED indicates the status of the JTAG connection:

- Off The target MSP430 is not controlled by the CrossConnect JTAG emulator.
- Flashing Red The target MSP430's Flash memory is being erased or programmed.
- Solid Red The target MSP430 is halted on a breakpoint.
- Flashing Green The target MSP430 is running code under control of the debugger.
- Solid Green The target MSP430 is running code but is not under control of the debugger.

###### Power LED indication

The POWER LED indicates the status of the CrossConnector's power provision:

- Solid Yellow The target MSP430 is being powered from the CrossConnector's 3.3V regulator
- Solid Red The target MSP430 is self-powered and is not being powered from the CrossConnector.
- Flashing Red/Yellow The target MSP430 has overloaded the CrossConnector and the regulator has been turned off.

If the CrossConnector is overloaded, it may be in an unstable state and will not be able to debug the target. You must unplug the CrossConnector and solve the problem that has cased the overloaded—using a separate power supply for your target board is an obvious solution.