CHAPTER 17μPD78E9860A, 78E9861AUser’s Manual U14826EJ5V0UD16417.1.3 On-board pin processingWhen performing programming on the target system, provide a connector on the target system to connect thededicated flash programmer.An on-board function that allows switching between normal operation mode and EEPROM programming modemay be required in some cases.PP pin>In normal operation mode, input 0 V to the V PP pin. In EEPROM programming mode, a write voltage of 10.0 V(TYP.) is supplied to the VPP pin, so perform either of the following.(1) Connect a pull-down resistor RVPP = 10 kΩ to the VPP pin.(2) Use the jumper on the board to switch the VPP pin input to either the programmer or directly to GND.A VPP pin connection example is shown below.Figure 17-4. VPP Pin Connection ExamplePD78E9860A, 78E9861AV PPConnection pin of dedicated flash programmerPull-down resistor (RV PP)μThe following shows the pins used by the serial interface.Serial Interface Pins UsedPseudo 3-wire P02, P01, P00When connecting the dedicated flash programmer to a serial interface pin that is connected to another device on-board, signal conflict or abnormal operation of the other device may occur. Care must therefore be taken with suchconnections.
