Re: Micro Controller Advice/Help Needed

On Tue, 12 Aug 2008 12:26:48 -0500, "deanvesuvio"
<deanvesuvio@xxxxxxxxx> wrote:

Rich - It seems like the LPC2138 or LPC2136 might provide a very simple
solution. Correct me if I'm wrong, but it looks like with one of these
chips, all I'd need to do is get a UART<->RS232 interface chip to put in
between the LPC213X and my XE2422H. Add on a power adapter and an RJ-11
jack, and that's literally 100% of my BOM (or so I'm thinking).

Probably (modulo the necessary passives, connectors, etc.).

Do get the part's User Manual, which goes through the details of its IAP
(in-application programming) command set and sequencing. The link to the
user manuals tends to be buried at the bottom of the part's page, with
the much briefer data sheet up at the top.

The only other thing I'm not quite clear on is the best mechanism to
program the LPC chip's flash prior to shipping a product. On a test device,
this should be easy, but I'm assuming I'd have to provide some sort of
harness for programming this thing. I guess I could use the other UART and
provide some sort of serial port pinout on the side of the board?

The NXP LPC2000-series chips come with an integral serial bootloader and
NXP provides a PC-side app to load the code, so you'll not need much
besides a serial cable. The ISP will use UART0, so you could either use
UART1 to the modem or use UART0 for both and provide the necessary
isolation so the PC serial port and the modem aren't fighting each
other.

Another alternative would be to use the chip's JTAG interface.

--
Rich Webb Norfolk, VA
.

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