M3850A Programmer

This page documents instructions for use of the Innovatia Renesas M3850A microcontroller programmer. The following design uses a DB-25 type parallel-port cable, and requires MS-DOS 6. 22 or earlier. This is because Microsoft Windows restricts access to the parallel-port except through Windows API, and also, Windows is inadequate for real-time port
M3850A Programmer - schematic

operation. A version of the programmer software was first written in Visual Basic on Windows, although because of Windows garbage-collection routines, the program was incapable of meeting the time constraint of the data reception time-out (mentioned briefly on page 64 of the data sheet, although the data sheet never mentions how long the data reception time-out is). The programmer operates the microcontroller in Standard Serial I/O mode, as described on page 53 of the data sheet. The main screen displays all the commands supported by the programmer software. Below the list of commands, there is an "Open File" field, which indicates the location of the last file which has been uploaded to or downloaded from the microcontroller. Below that is the size of the file. The "Port Address" field indicates the I/O address of the parallel port on the computer. At the bottom of the screen is the keyboard prompt. The line above that (blank in Figure 2) is the status label for the program, where status, error, and success messages will show up. When the program is launched, the keyboard prompt will ask for a command. At this point, the user will type in any of the commands listed in the command list. The commands are case insensitive. The commands are described in the following sections. Use this command is to change the I/O address of the parallel port. After entering the command, enter the address of the parallel port in Hexadecimal,...

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