Equinox Systems GEMINI Guide de l'utilisateur télécharger pdf (Page 47)

User Guide V1.10

Notes

RS-232 Transceiver

The Gemini programmer utilises ‘logic level’ signals on the ‘PROG_RXD’ and ‘PROG_TXD’

lines. This allows the programmer to be connected to the target system with no need for a

costly RS-232 Transceiver IC. However, if your target system uses the UART of the target

microcontroller during normal operation, it is likely that you will be using an RS-232

Transceiver IC on your board to drive the target serial port. If this is the case, it is necessary

to insert a resistor, R3, in the ‘PROG_TXD’ line as shown in the circuit schematic. This resistor

allows both the programmer and the Transceiver IC to drive the microcontroller RXD pin

without contention.

ISP Target System Design Guide - TEMIC Microcontrollers

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Equinox Systems GEMINI Guide de l'utilisateur Page 47