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Dynamic Switching of the FX2 CPU Clock. | Cypress Semiconductor

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Dynamic Switching of the FX2 CPU Clock.

Last Updated: March 29, 2011

Is it possible to change clock frequency while the chip is running?


Response:Yes. Bits 3 (CLKSPD0) and 4 (CLKSPD1) of the CPUCS register are used to set the CPU clock speed. At power-on-reset, these bits default to 00 (12 MHz). Firmware may modify these bits at any time.

00 -> 12 MHz (Default)
01 -> 24 MHz
10 -> 48 MHz
11 -> Reserved

Section 15.5.1 of the EZ-USB Technical Reference Manual explains about the CPUCS register.


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