LPC932 Crystal

[Uhland]

hi Forum,
i have soldered 2 x 20pf C and an highspeed Crystal with 11.059200 to P89LPC932, but i  cant get any crystal-clock signal from LPC932.  Can i assemble highspeed-Clock at first time without to go in ISP-Mode?

Pin9 ----||---| GND
         |        
    Crystal    
         |        
Pin8 ----||---| GND

[Yngwie]

you should configure the UCFG1 register to choose what kind of clock source you'll use.

[Joseph Goldburg]

I think the default is internal RC osc in the config for the first time - otherwise how would the ISP or Flashmagic guess the baud rate?

[Andy Ayre]

The default is the internal RC oscillator, so you need to use Flash Magic to connect and then change the device configuration to external crystal.

[Uhland]

thx for help!

[emyjob]

use flash magic 1.82 and 89LPC932 c version:
TXD,RXD connect to MAX232N,to COM232;
falsh magic config:COM1,9600,P89LPC932
    choose start bootrom... from the isp menu
    select the ''send break condition"option
    click on start bootrom

later,I click "start",but allways say:unable connect to.....
why?

[Andy Ayre]

Did you enable the break detect in the code you first programmed into the device?

Do you have the watchdog enabled in UCFG1?