Reset Pin; Port Pins; Regc Pin; Other Signal Pins - NEC 78K0 User Manual

28.6.3 RESET pin

If the reset signal of the dedicated flash programmer is connected to the RESET pin that is connected to the reset
signal generator on the board, signal collision takes place. To prevent this collision, isolate the connection with the
reset signal generator.
If the reset signal is input from the user system while the flash memory programming mode is set, the flash
memory will not be correctly programmed. Do not input any signal other than the reset signal of the dedicated flash
programmer.
µ
PD78F0148
RESET

28.6.4 Port pins

When the flash memory programming mode is set, all the pins not used for flash memory programming enter the
same status as that immediately after reset. If external devices connected to the ports do not recognize the port
status immediately after reset, the port pin must be connected to V

28.6.5 REGC pin

Handle the REGC pin in the same manner as during normal operation.
µ
•
PD78F0148, 78F0148(A): Connect directly to V
µ
•
PD78F0148(A1):

28.6.6 Other signal pins

Connect X1 and X2 in the same status as in the normal operation mode when using the on-board clock.
To input the operating clock from the programmer, however, connect the clock out of the programmer to X1, and its
inverse signal to X2.

28.6.7 Power supply

To use the supply voltage output of the flash programmer, connect the V
the V pin to V of the flash programmer.
SS SS
To use the on-board supply voltage, connect in compliance with the normal operation mode.
Supply the same other power supplies (EV
Caution In the dedicated flash programmer PG-FP3 or FL-PR3, V
sure to connect V
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CHAPTER 28
Figure 28-17. Signal Collision (RESET Pin)
Signal collision
Reset signal generator
In the flash memory programming mode, the signal output by the reset
signal generator collides with the signal output by the dedicated flash
programmer. Therefore, isolate the signal of the reset signal generator.
or connect to GND via a 1
DD
Connect directly to V
DD
, EV , AV
DD SS
and V to V and GND of the dedicated flash programmer.
DD SS DD
User's Manual U15947EJ2V0UD
µ
PD78F0148
Dedicated flash programmer
connection signal
Output pin
or V via a resistor.
*
DD SS
µ
pin to V
DD
, and AV ) as those in the normal operation mode.
REF SS
has a power monitor function. Be
DD
F capacitor
of the flash programmer, and
DD