what happens when peripheral clock changes?

[ANJUSHA]

hello sir/mam,     if crystal oscillator frequency is 12MHz…………then given  peripheral clock can be 15Mhz, 30Mhz, 60Mhz………..depending on a register APBDIV….in ARM….i want to know….what will be the change on the changing the pheripheral clock..which parameter varies.

[AJISH ALFRED]

Hi Abiram,

The CLOCK FREQUENCY parameter of the peripheral varies ans those parameters which are related to the CLOCK FREQUENCY.

In datasheet it might be given as CPU FREQUENCY or using similar terms!

Which peripheral of the ARM controller are you talking about?

[SHAH DISHANT H.]

Hi,

 

By changing the crystal frequency, the execution speed will vary.

 

If you are using peripherals on UART, it will nt work as BAUDRATE will be changed. For making it working, you have to change value of MULVAL and DIVVAL of ARM7 accordingly.

 

All the best.

[ANJUSHA]

thank you sir. i understand how relations between different clocks like pclk,cclk..in ARM

[SHAH DISHANT H.]

Ok.

 

All the best.

 

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