Keil forum I\O Speed Problem

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I\O Speed Problem

Siddharth Vaidya over 18 years ago

Hi,

I am using my LPC2364 at 75Mhz and i am getting maximum i|O frequency upto 13MHz only. Even if i toggle just one bit.

I want upto 16MHz minimum frequency of I\O. Can i do it with Thumb instructions or 13Mhz is the max??

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0 Viktor Bucher over 18 years ago in reply to Suvidh Kankariya

Use VPBDIV = 0x01
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0 Viktor Bucher over 18 years ago in reply to Suvidh Kankariya

Use VPBDIV = 0x01
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0 Siddharth Vaidya over 18 years ago in reply to Viktor Bucher

Hi Viktor,

What is VPBDIV. I searched for the same in the usermanual of lpc2364. This register is not present in my lpc.

Can you give me the details about which lpc u r refering to and what is the use of the statement.
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0 Viktor Bucher over 18 years ago in reply to Viktor Bucher

Actualy VPBDIV is for LPC21xx. Sorry for that. Check bit PPCLKSEL1[3:2] for LPC23xx. When set as 01you get PCLK = CCLK . With default value (00) you get PCLK = CCLK/4
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