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CHAPTER 23
PD178F098
User’s Manual U12790EJ2V0UD
<RESET pin>
If the reset signal of the dedicated flash programmer is connected to the RESET pin connected to the reset signal
generator 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 flash memory programming mode, a normal programming
operation cannot be performed.
Therefore, do not input reset signals from other than the dedicated flash
programmer.
Figure 23-9. Signal Conflict (RESET Pin)
<Port pins>
When the
PD178F098 enters the flash memory programming mode, all the pins other than those that communicate
in flash memory programming 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.
<Oscillator>
When 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 oscillator on-
board, and leave the X2 pin open.
<Power supply>
To use the power output from the flash programmer, connect the VDD and VDDPORT pins to VDD of the flash
programmer, and the GND0 to GND2 and GNDPORT pins 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.
Supply the same power as in the normal operation mode to the other power supply pins (AVDD, AVSS, VDDPLL,
and GNDPLL).
RESET
Connection pin of
dedicated flash
programmer
Reset signal generator
Signal conflict
Output pin
The signal output by the reset signal generator and the signal output from
the dedicated flash programmer conflict in the flash memory programming
mode, so isolate the signal of the reset signal generator.
PD178F098