Serial Interface of the Microcontroller to the PC via Cable
The diagram (figure1) below gives brief idea about
Serial cable or USB to serial conversion cable
RS232
Driver
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Target Board | Adapter/Cable | PC with Flash programming utility |
| Figure 1- Interface Diagram |
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Fujitsu standard Serial programming utility provides the asynchronous method to program the microcontroller. In order to connect the Microcontroller on board to the utility software, only the serial interface lines SOT (Transmit) and SIN (Receive) are necessary. On the PC side to establish a connection to the Microcontroller the RTS and CTS line should be connected together. The DTR should be connected to the DSR line in order to avoid the communication error. The RD line has to be connected to the SOT, and the TD line has to be connected to the SIN via the RS232 driver to the microcontroller for voltage level conversion.
The above whole connection requires the extra component such as RS232 driver and supporting components for driver on target board. The adapter cable eliminates the above component requirement and provides the complete solution. Hence no need of extra component on the user system for in circuit programming the Flash Microcontroller.
The Schematic of the adapter cable is shown in figure 2.
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