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<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.
µ
PD78F9488,
µ
PD78F9489
RESET
<Port pins>
µ
When the
PD78F9488 or 78F9489 enters the flash memory programming mode, all the pins other than those that
communicate with 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 V
<Resonator>
When using the on-board clock, connect X1, X2, XT1, and XT2 as required in the normal operation mode.
When using the clock output of the flash programmer, connect it directly to X1, disconnecting the main resonator
on-board, and leave the X2 pin open. The subsystem clock conforms to the normal operation mode.
<Power supply>
To use the power output from the flash programmer, connect the V
pin to GND of the flash programmer, respectively.
To use the on-board power supply, make connection in accordance 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 pins (AV
<Other pins>
Process the other pins (S0 to S27, COM0 to COM3, V
normal operation mode.
326
CHAPTER 19 FLASH MEMORY VERSION
Figure 19-7. Signal Conflict (RESET Pin)
Signal conflict
Reset signal generator
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.
or V
via a resistor.
DD
SS
LC0
User's Manual U15331EJ4V1UD
Connection pin of
dedicated flash
programmer
Output pin
pin to VDD of the flash programmer, and V
DD
to V
, CAPH, and CAPL) in the same manner as in the
LC2
and AV
).
DD
SS
SS
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