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M32C/8B 数据表(PDF) 95 Page - Renesas Technology Corp |
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M32C/8B 数据表(HTML) 95 Page - Renesas Technology Corp |
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95 / 406 page  Under development M32C/8B Group 9. Clock Generation Circuits Preliminary specification Specifications in this manual are tentative and subject to change. REJ09B0450-0050 Rev.0.50 Oct 31, 2008 Page 78 of 385 Figure 9.12 Procedure to Switch from On-chip Oscillator Clock to Main Clock Start End PRCR register: PRC0 bit = 1 Verified several times? 0 (Main clock oscillates) MCD register: bits MCD4 to MCD0 = 01000b CM2 register: CM22 bit = 0 CM2 register: CM21 bit = 0 PRC0 bit = 0 YES 1 (Main clock stops) NO Divide-by-8 mode Loss of the main clock is not detected Select the main clock as the CPU clock source Disable writing to registers associated with clocks Enable writing to registers associated with clocks Read the CM23 bit in the CM2 register |
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