Stuart - 2016-03-27

I'm using PIC18F85K90, with needs an addional IC for USB->UART.

I got thinking. If I can use a PIC18F2550 as a USB interface, with sutable passthrough software to the UART, then I can also use it for an in-circuit programmer for the PIC18F85K90.

Anyone done anything like this?

By default, the USB is bridged to the UART, then send a special sequence of characters to put it into usbpicprog mode.