Schematic diagram of the TBDML interface is shown in figure 1. The interface

has three main parts: the HC908JB8 MCU itself, BDM interface driver based

on 74HC(T)125 buffer with tri-state outputs and RS-232 programming interface

based on MAX232A or MAX202 driver. Please note that you do not need to

populate the RS-232 interface in case you have some other means of programming

the micro or a standalone RS-232 interface you can temporarily hook-up

to this board.