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CHAPTER 17μPD78E9860A, 78E9861AUser’s Manual U14826EJ5V0UD166If the reset signal of the dedicated flash programmer is connected to the RESET pin connected to the reset signalgenerator on-board, a signal conflict occurs. To prevent this, isolate the connection with the reset signal generator.If the reset signal is input from the user system in the EEPROM programming mode, a normal programmingoperation cannot be performed. Therefore, do not input other than reset signals from the dedicated flashprogrammer.Figure 17-7. Signal Conflict (RESET Pin)RESETConnection pin ofdedicated flashprogrammerReset signal generatorSignal conflictOutput pinThe signal output by the reset signal generator and the signal output fromthe dedicated flash programmer conflict in the EEPROM programmingmode, so isolate the signal of the reset signal generator.PD78E9860A, 78E9861AμWhen theμPD78E9860A and 78E9861A enter the EEPROM programming mode, all the pins other than thosethat communicate with the flash programmer are in the same status as immediately after reset.If the external device does not recognize initial statuses such as the output high impedance status, therefore,connect the external device to VDD or VSS via a resistor.• InμPD78E9860AWhen using the on-board clock, connect X1 and X2 as required in the normal operation mode.When using the clock output of the flash programmer, connect it directly to X1, disconnecting the main resonatoron-board, and leave the X2 pin open.• InμPD78E9861AConnect CL1 and CL2 as required in the normal operation mode, and connect the clock output of the flashprogrammer to the P03 pin.To use the power output from the flash programmer, connect the V DD pin to VDD of the flash programmer, andthe V SS pin to GND of the flash programmer.To use the on-board power supply, make connections that accord with the normal operation mode. However,because the voltage is monitored by the flash programmer, be sure to connect VDD of the flash programmer.
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