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It should be fairly straightforward to write and read a 25xxx eeprom thru the SPI bus using the pc serial port with Keil software. But nowhere do I find the DB-9 to SPI connections. Which pins connects to sck, mosi, miso,cs ? Can you help? Thanks, John
Are you talking about Keil's uVision IDE and/or a Keil ISP application? Is the target a Keil development board (or other Keil-supported development board) that has an external (to the MCU) EEPROM used to hold your application code and that the Keil tools would know how to program?