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ATmega169PV-8MCH 数据表(PDF) 39 Page - ATMEL Corporation |
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ATmega169PV-8MCH 数据表(HTML) 39 Page - ATMEL Corporation |
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39 / 393 page  39 8018N–AVR–08/09 ATmega169P “0011”, giving a division factor of 8 at start up. This feature should be used if the selected clock source has a higher frequency than the maximum frequency of the device at the present operat- ing conditions. Note that any value can be written to the CLKPS bits regardless of the CKDIV8 Fuse setting. The Application software must ensure that a sufficient division factor is chosen if the selected clock source has a higher frequency than the maximum frequency of the device at the present operating conditions. The device is shipped with the CKDIV8 Fuse programmed. Table 8-12. Clock Prescaler Select CLKPS3 CLKPS2 CLKPS1 CLKPS0 Clock Division Factor 0 000 1 0 001 2 0 010 4 0 011 8 0 100 16 0 101 32 0 110 64 0 111 128 1 000 256 1 001 Reserved 1 010 Reserved 1 011 Reserved 1 100 Reserved 1 101 Reserved 1 110 Reserved 1 111 Reserved |
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