RL78/G10 CHAPTER 20 FLASH MEMORY
R01UH0384EJ0311 Rev. 3.11 554
Dec 22, 2016
20.3.3 Port pins
In the flash memory programming mode, all the pins not used for flash memory programming enter the same status as
that immediately after reset. If an external device connected to the ports does not recognize the port status immediately
after reset, the port pin must be connected to either to V
DD or VSS via a resistor.
20.3.4 X1 and X2 pins (16-pin products only)
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 (fIH) is used.
20.3.5 Power supply
To perform serial programming by using 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.
Note that the operating voltage during flash memory programming must be in the range from 4.5 V to 5.5 V. If the on-
board supply voltage is less than 4.5 V, satisfy the requirement for operating voltage (4.5 V to 5.5 V) by, for example,
switching to the voltage from a dedicated flash memory programmer, and isolate the on-board supply voltage.
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