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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega644PA датащи(PDF) 42 Page - ATMEL Corporation |
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ATmega644PA датащи(HTML) 42 Page - ATMEL Corporation |
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42 / 468 page  42 8152G–AVR–11/09 ATmega164PA/324PA/644PA/1284P The CKDIV8 Fuse determines the initial value of the CLKPS bits. If CKDIV8 is unprogrammed, the CLKPS bits will be reset to “0000”. If CKDIV8 is programmed, CLKPS bits are reset to “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 8-16. Clock Prescaler Select CLKPS3 CLKPS2 CLKPS1 CLKPS0 Clock Division Factor 00 00 1 00 01 2 00 10 4 00 11 8 01 00 16 01 01 32 01 10 64 01 11 128 10 00 256 10 01 Reserved 10 10 Reserved 10 11 Reserved 11 00 Reserved 11 01 Reserved 11 10 Reserved 11 11 Reserved |
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