Could you describe connection to the uPD78F0058 for on-board programming?
Please make the circuit configuration as follows.
|Vpp||During programming connect a programmer via a switch or jumper, and during normal operation, connect to ground.|
|RESET||Design the circuit so that reset can be applied both on the board or from the programmer. |
Also, design the circuit to enable switching to the programmer side during programming, and to the board circuit side during normal operation.
|X1, X2||Leave the circuit unchanged so that the clock on the board can continue being used. (Don't do anything.)|
|Serial||Design the circuit so that the serial channel for programming can be connected to the programmer.|
|Vdd, Vss||Make connection to the programmer possible.|
The other signals can be left in the normal operation state.