35.17.14 PMC Main XTAL Frequency Register

(1) The reset value depends on the crystal connected between XIN and XOUT. For instance, for a 16 MHz crystal, the reset value would be 0x00000000.
Name: PMC_XTALF
Offset: 0x0034
Reset: (1)
Property: Read/Write

Bit 3130292827262524 
          
Access  
Reset  
Bit 2322212019181716 
          
Access  
Reset  
Bit 15141312111098 
          
Access  
Reset  
Bit 76543210 
      XTALF[2:0] 
Access R/WR/WR/W 
Reset  

Bits 2:0 – XTALF[2:0] Crystal Frequency

Indicates the currently used main crystal frequency to UTMI PHYs. This field must match the frequency of the implemented onboard crystal frequency.
ValueNameDescription
0 F16M The main crystal frequency is 16 MHz.
1 Reserved
2 F20M The main crystal frequency is 20 MHz.
3 F24M The main crystal frequency is 24 MHz.
4 Reserved
5 F32M The main crystal frequency is 32 MHz.
6 Reserved
7 Reserved