Datasheet

RL78/L12 CHAPTER 26 FLASH MEMORY
R01UH0330EJ0200 Rev.2.00 813
Dec 13, 2013
26.3.3 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 to V
DD or EVDD, or VSS or EVSS, via a resistor.
26.3.4 REGC pin
Connect the REGC pin to GND via a capacitor (0.47 to 1
μ F) in the same manner as during normal operation. Also,
use a capacitor with good characteristics, since it is used to stabilize internal voltage.
26.3.5 X1 and X2 pins
Connect X1 and X2 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.
26.3.6 Power supply
To use the supply voltage output of the flash memory programmer, connect the V
DD pin to VDD of the flash memory
programmer, and the VSS pin to GND of the flash memory programmer.
To use the on-board supply voltage, connect in compliance with the normal operation mode.
However, when writing to the flash memory by using the flash memory programmer and using the on-board supply
voltage, 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.
Supply the same other power supplies (EV
DD, EVSS) as those VDD and VSS.