Dear All
In the Olimex schematic, a short link (i.e. 0 ohms resistor) is placed across the crystal.
What is the purpose of a short link?
I assume you’re talking about this:
http://www.sparkfun.com/datasheets/LPC/ … TK-sch.gif
Not sure why they put that resistor in the schematic (R80), but the schematic shows that it is not mounted (ie, “NA”).
In future, it’s a good idea to post links if you want anyone to reply…
Dear All
Michael, thank you for the reply…
I have a few queries regarding Flash Magic Software & LPC2478
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If oscillator & baudrate are selected in flashmagic then why is auto bauding required?
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As per user manual, the internal RC Oscillator is selected on power on. So if the external oscillator is not oscillating or is not connected, then will flash magic detect the chip signature?
Hi
Not sure about question 2 but the PC needs to have a fixed Baud - it doesn’t auto-baud, only the chip does. Not all speeds are possible (depends on processor and clock - eg. I can’t get faster than 38400kB with my LPC2148 board but can get 115200Baud with other LPCs) - therefore it seems necessary to be able to select the PC Baud rate to ensure that communication is possible.
Regards
Mark
P.S. According to the LPC24XX user’s manual (section “Flash Memory Programming Firmware”) it states that the “When ISP mode is entered after a power on reset, the IRC and PLL are used to generate CCLK of 14.728MHz”. This should mean that it can auto-baud to any rate standard Baud from 9’600 to 230400.