RL78/G10 CHAPTER 20 FLASH MEMORY
R01UH0384EJ0311 Rev. 3.11 552
Dec 22, 2016
20.2 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.
20.2.1 Programming Environment
The environment required for writing a program to the flash memory of the RL78 microcontroller is illustrated below.
Figure 20-3. Environment for Writing Program to Flash Memory
RL78
microcontroller
External device
(such as microcontroller
and ASIC)
V
DD
VSS
RESET
TOOL0 (dedicated
single-line UART)
Processing to write data to or delete data from the RL78 microcontroller by using an external device is performed on-
board. Off-board writing is not possible.
20.2.2 Communication Mode
Communication between the external device and the RL78 microcontroller is established by serial communication using
the TOOL0 pin via the dedicated UART of the RL78 microcontroller.
Transfer rate: Fixed to 115200 bps
Figure 20-4. Communication with External Device
VDD
VSS
RESET
V
DD
GND
RESETOUT
RL78
microcontroller
External device
(such as microcontroller
and ASIC)
TOOL0TxD/RxD
The external device generates the following signals for the RL78 microcontroller.
Table 20-2. Pin Connection
External Device RL78 microcontroller
Signal Name I/O Pin Function Pin Name
VDD I/O VDD voltage generation/power monitoring VDD
GND
−
Ground VSS
RESETOUT Output Reset signal output RESET
RxD Input Receive signal TOOL0
TxD Output Transmit signal
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