Chapter 18 Flash EEPROM

18-6 Onboard Serial Programming Mode

18-6-1 Overview

The onboard serial programming mode is primarily used to program the flash EEPROM in devices that are already installed on a PCB board with internal serial interface.

„Hardware and software requirements

Hardware and software products required for onboard serial programming are as follows.

Hardware requirements

xOnboard serial writer (YDC MODEL: AF200)

xFlash programming connectors or pins for target board.

Software requirements

xLoad program installed in the internal flash EEPROM

xProgramming algorithm for operating onboard serial writer

„Cautions on onboard serial programming

xPower supply voltage during programming should be within 2.7 V to 3.6 V. If you program outside t h i s limit, reliability of the written data may be damaged.

xAlways set the pull-up resistors on the target board so that serial interface communication pins does not become floating state. The pull-up resistors are necessary for the Flash EEPROM not to enter the programming mode when the serial writer is not connected.

xSerial interface I/O pins used for onboard serial programming should be reserved as dedicated pins to prevent other user circuits from communicating with the device. Altenatively, design your target board to be capable of normal communication with serial writer.

xInstall the switch that controlls Vpp pin which supplies +5 V during Flash EEPROM programming and supplies same potential (VDD) during other operations.

XVIII-12Onboard Serial Interface Programming Mode

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Panasonic MN101C77C, F77G user manual Onboard Serial Programming Mode, Overview