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USB Low-Full-High Speed Peripherals

Contributor II

Hello,

fx2lp clock is having external  clock source as 24MHz,(not using crystal oscillator).but if i set CPUCS = 0x02; that is 12MHz,

if i do this,Is fx2lp clock reduced to 12MHz even its supplied with 24MHz?

or

its only effect on SYNCDELAY?

let me know.

regards,

geetha.

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1 Solution
Moderator
Moderator

Hello Geethanjali,

The CPUCS value determines the frequency at which the FX2LP will operate. The crystal oscillator/clock source is an input to the PLL which generates the clock of frequency determined by the CPUCS register.

Best regards,

Srinath S

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3 Replies
Moderator
Moderator

Hello Geethanjali,

The CPUCS value determines the frequency at which the FX2LP will operate. The crystal oscillator/clock source is an input to the PLL which generates the clock of frequency determined by the CPUCS register.

Best regards,

Srinath S

View solution in original post

Contributor II

Hello shrinath,

If i connect clock source as 12MHZ(that is input to PLL),can i generate 24 or 48MHZ as CPU clcok by configuring the CPUCS register?

regards,

geetha.

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Moderator
Moderator

Hello Geethanjali,

FX2LP can only take 24 MHz crystal oscillator clock input. 12 MHz and 48 MHz frequency clock can be derived from this.

Best regards,

Srinath S

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