I am following the procedure in R01AN0815EJ0100 to develop a on board programming an empty RL78 MCU.
From the procedure, I can control the Reset and TOOL0 on off timing. But I seems to be unable to get the MCU to enter into the programming mode. I would like to find out, if there is other documents related to this procedure.
If my hardware is connect using the Two-wire UART connection. During the power on, I do not send the "1-byte data for setting mode" and the "Baud Rate set command frame" Will the MCU go into programming mode?
Al, If you do not send the "1-byte data for setting mode", the MCU will NOT go into programming mode. However, you can use Hardware timing instead of a UART on Tool0. Between timing points <5> and <6>, the Tool0 line must go to logic low for 78.125uSEC, which is the same timing as "00h" @ 115,200 bps. You can use an external MCU to create 78.125uSEC logic low pulse. -MikeC.
In reply to Mike Clements: