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M16C/62P bảng dữ liệu(PDF) 72 Page - Mitsubishi Electric Semiconductor |
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M16C/62P bảng dữ liệu(HTML) 72 Page - Mitsubishi Electric Semiconductor |
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72 / 349 page  Clock Generation Circuit 71 Mitsubishi microcomputers M16C / 62P Group SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER Under development Preliminary Specifications Rev.1.0 Specifications in this manual are tentative and subject to change. System Clock Protective Function When the main clock is selected for the CPU clock source, this function disables the clock against modifica- tions in order to prevent the CPU clock from becoming halted by run-away. If the PM21 bit of PM2 register is set to “1” (clock modification disabled), the following bits are protected against writes: • CM02, CM05, and CM07 bits in CM0 register • CM10, CM11 bits in CM1 register • CM20 bit in CM2 register • All bits in PLC0 register Before the system clock protective function can be used, the following register settings must be made while the CM05 bit of CM0 register is “0” (main clock oscillating) and CM07 bit is “0” (main clock selected for the CPU clock source): (1) Set the PRC1 bit of PRCR register to “1” (enable writes to PM2 register). (2) Set the PM21 bit of PM2 register to “1” (disable clock modification). (3) Set the PRC1 bit of PRCR register to “0” (disable writes to PM2 register). Do not execute the WAIT instruction when the PM21 bit is “1”. |
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