Datasheet
78K0/Ix2 CHAPTER 25 FLASH MEMORY
R01UH0010EJ0500 Rev.5.00 656
Feb 28, 2012
25.4.2 RESET pin
If the reset signal of the dedicated flash memory 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 memory
programmer.
Figure 25-4. Signal Collision (RESET Pin)
RESET
Dedicated flash
memory
programmer connection signal
Reset signal generator
Signal collision
Output pin
In the flash memory programming mode, the signal output by the reset
signal generator collides with the signal output by the dedicated flash
memory
programmer. Therefore, isolate the signal of the reset signal
generator.
78K0/Ix2
microcontrollers
25.4.3 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
DD or VSS via a resistor.
25.4.4 REGC pin
Conn
ect the REGC pin to VDD via a capacitor (0.47 to 1
F) in the same manner as during normal operation. However,
when using the STOP mode that has been entered since operation of the internal high-speed oscillation clock and external
main system clock, 0.47
F is recommended. Also, use a capacitor with good characteristics, since it is used to stabilize
internal voltage.
25.4.5 Other signal pins
Conn
ect X1 and X2 in the same status as in the normal operation mode.
Remark In the flash memory programming mode, the internal high-speed oscillation clock (f
IH) is used.
25.4.6 Power supply
T
o use the supply voltage output of the flash memory programmer, connect the V
DD pin to VDD of the flash memory
programmer, and the V
SS pin to GND of the flash memory programmer.
To use the on-board supply voltage, connect in compliance with the normal operation mode.
However, be sure to connect the V
DD and VSS pins to VDD and GND of the flash memory programmer to use the power
monitor function with the flash memory programmer, even when using the on-board supply voltage.
Supply the same other power supplies (AV
REF and AVSS) as those in the normal operation mode.