Rainbow Electronics W90N745CDG - Manual (Page 49)

W90N745CD/W90N745CDG
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PLL Control Register0 （PLLCON0）
W90N745 provides two clock generation options – crystal and oscillator. The external clock via
EXTAL(15M) Minput pin as the reference clock input of PLL module. The external clock can bypass the
PLL and be used to the internal system clock by pull-down the data D15 pin. Using PLL’s output clock
for the internal system clock, D15 pin must be pull-up.
REGISTER ADDRESS R/W DESCRIPTION RESET VALUE
PLLCON 0xFFF0_0008 R/W PLL Control Register 0x0000_2F01
31 30 29 28 27 26 25 24
RESERVED
23 22 21 20 19 18 17 16
RESERVED PWDEN
15 14 13 12 11 10 9 8
FBDV
7 6 5 4 3 2 1 0
FBDV OTDV INDV
BITS DESCRIPTION
[31:17] RESERVED -
[16] PWDEN
Power down mode enable
0 = PLL is in normal mode (default)
1 = PLL is in power down mode
[15:7] FBDV
PLL VCO output clock feedback divider
Feedback Divider divides the output clock from VCO of PLL.
[6:5] OTDV
PLL output clock divider
OTDV [6:5] DIVIDED BY
0 0 1
0 1 2
1 0 2
1 1 4
[4:0] INDV
PLL input clock divider
Input divider divides the input reference clock into the PLL.