B.2 Implementation
Implementation
The output signals shown in Figure B-1 :
• TX/RX – 9600 baud, 8N1 UART.
• RST/NMI – connects to target’s RST/NMI pin.
• TEST – connects to target’s TEST pin for MSP430 devices having shared JTAG pins
• TCK – connects to target’s TCK pin for MSP430 devices having dedicated JTAG pins.
• Status LED – optional status LED. Indicates that the host’s DCO was successfully calibrated when
illuminated at power-up. Later, the LED is illuminated whenever timer is active.
• Protocol Status LED1 – optional status LED. Illuminated whenever an ACK character or a message is
received from the target.
• Protocol Status LED2 – optional status LED. Illuminated after a transmit message is sent to the target.
• Protocol Status LED3 – optional status LED. Illuminated whenever a NACK is received from the target.
Also illuminated to indicate a failure.
• Protocol Status LED4 – optional status LED. Illuminated to indicate a successful operation.
Figure B-2 and Figure B-3 contain a flow chart for the BSL Replicator application. It illustrates the logic
flow for the main program loop. In Figure B-2 , an exit from low-power mode 0 (LPM0) occurs after either a
Timer_A interrupt or receiving a character from the target BSL.
24 Features of the MSP430 Bootstrap Loader SLAA089D – December 1999 – Revised August 2006
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