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

26.6.3 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.
78K0/KE2
RESET

26.6.4 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

26.6.5 REGC pin

Connect the REGC pin to GND via a capacitor (0.47

26.6.6 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 EXCLK.
Cautions 1. Only the internal high-speed oscillation clock (f
2. Only the X1 clock (f
26.6.7 Power supply
To use the supply voltage output of the flash programmer, connect the V
the V pin to GND of the flash programmer.
SS
However, be sure to connect the V
monitor function with the flash programmer.
To use the on-board supply voltage, connect in compliance with the normal operation mode.
Supply the same other power supplies (EV
568
CHAPTER 26 FLASH MEMORY
Figure 26-11. 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.
µ
F: target) in the same manner as during normal operation.
) or external main system clock (f
X
and V pins to V
DD SS
, EV , AV
DD SS
Preliminary User's Manual U17260EJ3V1UD
Dedicated flash programmer
connection signal
Output pin
or V via a resistor.
DD SS
) can be used when CSI10 is used.
RH
) can be used when UART6 is used.
EXCLK
pin to V
DD
and GND of the flash programmer to use the power
DD
, and AV ) as those in the normal operation mode.
REF SS
of the flash programmer, and
DD