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ICS1531 датащи(PDF) 38 Page - Integrated Circuit Systems |
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ICS1531 датащи(HTML) 38 Page - Integrated Circuit Systems |
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38 / 76 page ![]() ICS1531 Rev N 12/1/99 December, 1999 38 Chapter 6 Register Set ICS1531 Data Sheet - Preliminary Copyright © 1999, Integrated Circuit Systems, Inc. All rights reserved. 6.5.17 Register 20h: PNLCLK-M The PNLCLK-M Register is used to divide the reference frequency provided to the PNLCLK PLL. The ‘M’ value is used to determine the output frequency of the PLL as specified in the equation given in Section 6.5.18, “Register 21h: PNLCLK-N”. 6.5.18 Register 21h: PNLCLK-N The PNLCLK-N Register is used to determine the output frequency of the PNLCLK. To determine the PNLCLK frequency (which is in units of MHz), use the following equation: FPNLCLK = Table 6-17. PNLCLK-M Register Bit Bit Name Bit Definition Ac- cess Spec. Func. Re- set 20:7- 20:0 PNLCLK_M [7-0] PNLCLK_M (Reference Divider) [7-0]. • This register includes bits for the PNLCLK Reference Divider. • The value in this register is used as the variable ‘M’ in the frequency equation given in Section 6.5.18, “Register 21h: PNLCLK-N”. R/W D-PK 0 Table 6-18. PNLCLK-N Register Bit Bit Name Bit Definition Ac- cess Spec. Func. Re- set 21:7- 21:0 PNLCLK_N [7-0] PNLCLK_N (Feedback Divider) [7-0]. • This register includes bits for the PNLCLK Feedback Divider. • The value in this register is used as the variable ‘N’ in the frequency equation for the PNLCLK. R/W D-PK 0 OSC × (N + 8) (M + 2) |
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