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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M68ICS08GR датащи(PDF) 107 Page - Freescale Semiconductor, Inc |
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M68ICS08GR датащи(HTML) 107 Page - Freescale Semiconductor, Inc |
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107 / 408 page  Clock Generator Module (CGMC) Functional Description MC68HC908GR8 — Rev 4.0 Technical Data MOTOROLA Clock Generator Module (CGMC) 107 allows. See Electrical Specifications. Choose the reference divider, R = 1. After choosing N and P, the actual bus frequency can be determined using equation in 2 above. When the tolerance on the bus frequency is tight, choose fRCLK to an integer divisor of fBUSDES, and R = 1. If fRCLK cannot meet this requirement, use the following equation to solve for R with practical choices of fRCLK, and choose the fRCLK that gives the lowest R. 4. Select a VCO frequency multiplier, N. Reduce N/R to the lowest possible R. 5. If N is < Nmax, use P = 0. If N > Nmax, choose P using this table: Then recalculate N: 6. Calculate and verify the adequacy of the VCO and bus frequencies fVCLK and fBUS. 7. Select the VCO’s power-of-two range multiplier E, according to Current N Value P 0 1 2 3 R round R MAX f VCL KDES f RCL K -------------------------- integer f VCLKDES f RCLK -------------------------- – × = N round Rf VCLKDES × f RCL K ------------------------------------- = 0N <N max ≤ N max N <N max 2 × ≤ N max 2 × N <N max 4 × ≤ N max 4 × N <N max 8 × ≤ N round Rf VC LKD ES × f RCLK 2 P × ------------------------------------- = f VCL K 2 P NR ⁄ × () f RCL K × = f BU S f VC LK () 4 ⁄ = Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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