Interactive Serial Programmer

Circuit

The IRTC ISP is similar to the TI serial programmer explained in their application note. However, the function has been performed using a 3V RS232 level convertion chip.

The DTR line on the serial port controls the RST/NMI operation, switching between program and development mode along with the RTS line which controls the TEST pin.. The RS232 Rx and Tx lines drive the P2.2 and P1.1 pins. When first uploading the TLM the TI BSLDEMO.EXE program is used. After this the TLM takes control and all furter application programming is done via the TLM code.

The ISP is powered from the target system and requires the following connections to the target processor;

Header Signal Connector 6 way

Pin1 - Red - VCC +2.7 - 3.3 Volts

Pin2 - Black/Scr - GND 0 Volts

Pin3 - Blue - Rx

Pin4 - Green - Tx

Pin5 - Black - Test

Pin6 - White - RESET Target CPU Reset

The ISP must also be connected to the host computers serial port, COM1.

The Target and the ISP should be powered up together to ensure they reset properly. It is also important that the ISP is connected to an operating serial port with PC running prior to power-up.

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