Serial Interface of the Microcontroller to the PC via Cable

The diagram (figure1) below gives brief idea about all-necessary connections, which has to be done to program the on chip Flash memory.

Serial cable or USB to serial conversion cable

RS232

Driver

 

 

 

Adapter

Serial Interface

 

 

 

Module

Cable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Target Board

Adapter/Cable

PC with Flash programming utility

 

Figure 1- Interface Diagram

 

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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Fujitsu FMC-16LX/FR manual Serial Interface of the Microcontroller to the PC via Cable

FMC-16LX/FR specifications

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