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AT90CAN128 数据表(PDF) 35 Page - ATMEL Corporation |
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AT90CAN128 数据表(HTML) 35 Page - ATMEL Corporation |
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35 / 413 page  35 AT90CAN128 4250E–CAN–12/04 domain allows using this Timer/Counter as a real-time counter even when the device is in sleep mode. ADC Clock – clk ADC The ADC is provided with a dedicated clock domain. This allows halting the CPU and I/O clocks in order to reduce noise generated by digital circuitry. This gives more accu- rate ADC conversion results. Clock Sources The device has the following clock source options, selectable by Flash Fuse bits as shown below. The clock from the selected source is input to the AVR clock generator, and routed to the appropriate modules. Note: 1. For all fuses “1” means unprogrammed while “0” means programmed. The various choices for each clocking option is given in the following sections. When the CPU wakes up from Power-down or Power-save, the selected clock source is used to time the start-up, ensuring stable Oscillator operation before instruction execution starts. When the CPU starts from reset, there is an additional delay allowing the power to reach a stable level before starting normal operation. The Watchdog Oscillator is used for tim- ing this real-time part of the start-up time. The number of WDT Oscillator cycles used for each time-out is shown in Table 6. The frequency of the Watchdog Oscillator is voltage dependent as shown in “AT90CAN128 Typical Characteristics” on page 374. Default Clock Source The device is shipped with CKSEL = “0010”, SUT = “10”, and CKDIV8 programmed. The default clock source setting is the Internal RC Oscillator with longest start-up time and an initial system clock prescaling of 8. This default setting ensures that all users can make their desired clock source setting using an In-System or Parallel programmer. Table 5. Device Clocking Options Select(1) Device Clocking Option CKSEL3..0 External Crystal/Ceramic Resonator 1111 - 1000 External Low-frequency Crystal 0111 - 0100 Calibrated Internal RC Oscillator 0010 External Clock 0000 Reserved 0011, 0001 Table 6. Number of Watchdog Oscillator Cycles Typ Time-out (VCC = 5.0V) Typ Time-out (VCC = 3.0V) Number of Cycles 4.1 ms 4.3 ms 4K (4,096) 65 ms 69 ms 64K (65,536) |
类似零件编号 - AT90CAN128 |
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类似说明 - AT90CAN128 |
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