Lpc2000

Hi lpc2000,

I have seen this question sometimes on this list. I think many users find
the problem of the serial port programming only working for the first time
on the user designed boards. I think this is caused by the wrong BSL or
RESET pin timing at power on prevents the controller from going into
bootloader mode.

The controller must be in bootload mode for the serial port programming to
work. If the BSL or RESET pin timing is wrong, an unused controller will
still go in to bootloader mode because there is no valid user code to
execute (this is why it works for the first time). After the first time it
is necessary for the BSL and RESET pin timing to be correct, otherwise the
last programmed user code is executed.

Kind regards,

Nic