RL78/G15 CHAPTER 19 FLASH MEMORY
R01UH0959EJ0110 Rev.1.10 Page 660 of 765
Mar 7, 2023
19.2 Writing to Flash Memory by Using External Device (that
Incorporates UART)
On-board data writing to the internal flash memory is possible by using the RL78 microcontroller and an external device
(a microcontroller or ASIC) connected to a UART.
On the development of flash memory programmer by user, refer to the RL78 Microcontrollers (RL78 Protocol B) Serial
Programming Edition Application Note (R01AN6332).
19.2.1 Programming environment
The environment required for writing a program to the flash memory of the RL78 microcontroller is illustrated below.
Figure 19-3. Environment for Writing Program to Flash Memory
TOOL0 (dedicated single-line UART)
External device
(such as microcontroller and ASIC)
V
DD
V
SS
RL78 microcontroller
______
RESET
UART (TOOLTxD, TOOLRxD)
Processing to write data to or erase data from the RL78 microcontroller by using an external device is performed on-
board. Off-board writing is not possible.
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