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ATTINY2313-20PU Datenblatt(PDF) 25 Page - ATMEL Corporation |
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ATTINY2313-20PU Datenblatt(HTML) 25 Page - ATMEL Corporation |
25 / 231 page 25 ATtiny2313/V 2543I–AVR–04/06 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, 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 commencing normal operation. The Watchdog Oscillator is used for timing this real-time part of the start-up time. The number of WDT Oscillator cycles used for each time-out is shown in Table 3. The frequency of the Watchdog Oscillator is voltage dependent as shown in “ATtiny2313 Typical Characteristics” on page 185. Default Clock Source The device is shipped with CKSEL = “0100”, 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, resulting in 1.0 MHz system clock. This default setting ensures that all users can make their desired clock source setting using an In-System or Parallel programmer. Crystal Oscillator XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can be configured for use as an On-chip Oscillator, as shown in Figure 12 on page 26. Either a quartz crystal or a ceramic resonator may be used. C1 and C2 should always be equal for both crystals and resonators. The optimal value of the capacitors depends on the crystal or resonator in use, the amount of stray capac- itance, and the electromagnetic noise of the environment. Some initial guidelines for choosing capacitors for use with crystals are given in Table 4 on page 26. For ceramic resonators, the capacitor values given by the manufacturer should be used. Table 2. Device Clocking Select (1) Device Clocking Option CKSEL3..0 External Clock 0000 Calibrated Internal RC Oscillator 4MHz 0010 Calibrated internal RC Oscillator 8MHz 0100 Watchdog Oscillator 128kHz 0110 External Crystal/Ceramic Resonator 1000 - 1111 Reserved 0001/0011/0101/0111 Table 3. 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 512 65 ms 69 ms 8K (8,192) |
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Ähnliche Beschreibung - ATTINY2313-20PU |
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