embpic
Advanced Member level 3
hello master's
i am using lpc2148 and using arm dev. board but i need to design for my project. and i have some doubts in design as follows.
1. I want to use supply which is optional whether to from USB or +5v DC power supply from wall socket.
2. if I connect vcc of USB to Vcc of Power supply and I am using both USB and external power supply then will it harmful to PC?
or I have to keep it isolated from each other.
3. how to include ISP & J-TAG debugging (10-pin) for loading firmware.
4. also thinking to add microSD in design.
i have attached circuit diagram which was got with dev board. and i am using it for core.
i am using lpc2148 and using arm dev. board but i need to design for my project. and i have some doubts in design as follows.
1. I want to use supply which is optional whether to from USB or +5v DC power supply from wall socket.
2. if I connect vcc of USB to Vcc of Power supply and I am using both USB and external power supply then will it harmful to PC?
or I have to keep it isolated from each other.
3. how to include ISP & J-TAG debugging (10-pin) for loading firmware.
4. also thinking to add microSD in design.
i have attached circuit diagram which was got with dev board. and i am using it for core.