CHAPTER 16 FLASH MEMORY (μμμμPD70F3017 AND 70F3017Y ONLY)36216.5 Pin ConnectionWhen performing on-board writing, install a connector on the target system to connect to the dedicated flashwriter. Also, install the function on-board to switch from the normal operation mode to the flash memory programmingmode.When switched to the flash memory programming mode, all the pins not used for the flash memory programmingbecome the same status as that immediately after reset. Therefore, all the ports become output high-impedancestatus, so that pin handling is required when the external device does not acknowledge the output high-impedancestatus.16.5.1 V PP pinIn the normal operation mode, 0 V is input to V PP pin. In the flash memory programming mode, 7.8 V writingvoltage is supplied to V PP pin. The following shows an example of the connection of V PP pin.VPPDedicated flash writer connection pinPull-down resistor (RVPP)V850/SA116.5.2 Serial interface pinThe following shows the pins used by each serial interface.Serial Interface Pins UsedCSI0 SO0, SI0, SCK0UART0 TXD0, RXD0When connecting a dedicated flash writer to a serial interface pin which is connected to other devices on-board,care should be taken to the conflict of signals and the malfunction of other devices, etc.
