rl78check is an Arduino-based Platformio project which checks flash security configuration of connected RL78 MCU.

The app communicates with a RL78 chip over single wire serial interface using Protocol A. After initializing the connection get silicon signature and get security commands are executed to retrieve MCU data and settings. The information are further printed over primary serial.

After updating TOOL0_PIN and RESET_PIN to match your configuration build and upload the project. Since a hardware serial in half-duplex mode is utilized to communicate with RL78 please make sure to match TOOL0_PIN with the UART TX pin. Connect TOOL0_PIN and RESET_PIN to corresponding RL78 pins and you are ready to go. Open up a serial console and press any key to trigger communication with the MCU. Acquired results will be printed over primary serial with baudrate of 115200.

Silicon signature
DEC: 10 00 06 
DEV: 52 35 46 31 30 32 36 41 20 20 
CEN: ff 3f 00 
DEN: ff 17 0f 
VER: 03 00 03 

MCU Security
FLG: fe 
BOT: 03 
SSL: 00 
SSH: 00 
SEL: 0f 
SEH: 00 

Security flag properties
        Programming enabled
        Block erase enabled
        Boot block cluster rewrite enabled
        Boot area exchange flag not provided

Press any key to continue ..

• tested on BluePill with Renesas RL78 G13