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ATTINY817-MFR. Datasheet(PDF) 60 Page - Microchip Technology |
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ATTINY817-MFR. Datasheet(HTML) 60 Page - Microchip Technology |
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60 / 492 page  CLK_MAIN is fed into a prescaler before it is used by the peripherals (CLK_PER) in the device. The prescaler divide CLK_MAIN by a factor from 1 to 64. Figure 10-2. Main Clock and Prescaler (Div 1, 2, 4, 8, 16, 32, 64, 6, 10, 24, 48) OSC20M 32kHz Osc. 32.768kHz crystal Osc. External clock CLK_MAIN CLK_PER Main Clock Prescaler The Main Clock and Prescaler configuration registers (CLKCTRL.MCLKCTRLA, CLKCTRL.MCLKCTRLB) are protected by the Configuration Change Protection Mechanism, employing a timed write procedure for changing these registers. Related Links CCP - Configuration Change Protection 10.3.3 Main Clock after Reset After any Reset, CLK_MAIN is provided by the 16/20MHz oscillator (OSC20M) and with a Prescaler division factor of 6. Since the actual frequency of the OSC20M is determined by the Frequency Select bits (FREQSEL) of the Oscillator Configuration fuse (FUSE.OSCCFG), these frequencies are possible after Reset: Table 10-1. Peripheral Clock Frequencies after Reset CLK_MAIN as per FREQSEL in FUSE.OSCCFG Resulting CLK_PER 16MHz 2.66MHz 20MHz 3.33MHz See the OSC20M description for further details. Related Links 16/20MHz Oscillator (OSC20M) 10.3.4 Clock Sources All internal clock sources are enabled automatically when they are requested by a peripheral. The crystal oscillator, based on an external crystal, must be enabled by writing a '1' to the ENABLE bit in the 32KHz Crystal Oscillator Control A register (CLKCTRL.XOSC32KCTRLA) before it can serve as clock source. The respective Oscillator Status bits in the Main Clock Status register (CLKCTRL.MCLKSTATUS) indicate whether the clock source is running and stable. Related Links FUSES - Configuration and User Fuses CCP - Configuration Change Protection 10.3.4.1 Internal Oscillators The internal oscillators do not require any external components to run. See the related links for accuracy and electrical characteristics. 16/20MHz Oscillator (OSC20M) This oscillator can operate at multiple frequencies, selected by the value of the Frequency Select bits (FREQSEL) in the Oscillator Configuration fuse (FUSE.OSCCFG). The center frequencies are: ATtiny417/817 © 2017 Microchip Technology Inc. Datasheet Complete DS40001901B-page 60 |
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