RL78/G15 CHAPTER 19 FLASH MEMORY
R01UH0959EJ0110 Rev.1.10 Page 663 of 765
Mar 7, 2023
19.3.2 RESET
¯¯¯¯¯¯
pin
Signal conflict will occur if the reset signal of the dedicated flash memory programmer and external device are connected
to the RESET
¯¯¯¯¯¯
pin that is connected to the reset signal generator on the board. To prevent this conflict, isolate the
connection with the reset signal generator.
The flash memory will not be correctly programmed if the reset signal is input from the user system while the flash
memory programming mode is set. Do not input any signal other than the reset signal of the dedicated flash memory
programmer and external device.
Figure 19-5. Signal Conflict (RESET
¯¯¯¯¯¯
Pin)
In the flash memory programming mode, a signal output by another device
will conflict with the signal output by the dedicated flash memory
programmer. Therefore,
isolate the signal of another device.
Dedicated flash memory programmer
connection pin
Input pin
Signal conflict
Another device
Output pin
RL78
microcontroller
19.3.3 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 either V
DD
or V
SS
via a resistor.
19.3.4 X1 and X2 pins (16-pin and 20-pin products)
Connect X1 and X2 pins in the same status as in the normal operation mode.
Remark In the flash memory programming mode, the high-speed on-chip oscillator clock (f
IH
) is used.
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