ya, I am trying not to use an xtal clock cos alot of the code is written and when I do the maths TH1 should be 0xFD to be transmitting at 9600 but its not. Maybe there is some register I miss'd out or value in something else I got wrong? Internal clock is 7.363MHz

Samuel

---

From: finn_li <li_finn@...>

To: lpc900_users@yahoogroups.com

Sent: Tuesday, April 7, 2009 11:09:48 PM

Subject: [lpc900_users] Re: LPC938 Baudrate generator

Hi Samuel;

What is your system clock? If the internal oscillator cannot make ikt, try xtal or external clock.

Feng
--- In lpc900_users@yahoogroups.com, "SR" <emddjava@...> wrote:
>
> Hi
>
> I am using LPC938, I am trying to get the UART's baudrate to 9600 but nothing seems to work..I the following code and all I see on hyperterm is just various ASCII characters.
>
>    EA = 0;
>     TR1 = 0;        /* stop timer 1 */
>     ET1 = 0;        /* disable timer 1 interrupt */
>
>     TH1 = 0xFC;  //(unsigned char) (256 - (clock / (16L * 12L * baudrate)));
>
>     PCON |= 0x80;        /* 0x80=SMOD: set serial baudrate doubler */
>
>     TMOD &= ~0xF0;        /* clear timer 1 mode bits */
>     TMOD |= 0x20;        /* put timer 1 into MODE 2 */
>     SCON = 0x50;
>
>     TR1 = 1;        /* start timer 1 */
>
>
>     INT_ENABLE;
>
>
>     EA = 1;
>
> Samuel
>

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