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ATTINY28V-1PC Datasheet(PDF) 4 Page - ATMEL Corporation |
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ATTINY28V-1PC Datasheet(HTML) 4 Page - ATMEL Corporation |
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4 / 75 page  4 ATtiny28L/V 1062E–10/01 Clock Options The device has the following clock source options, selectable by Flash Fuse bits as shown in Table 1. Note: “1” means unprogrammed, “0” means programmed. The various choices for each clocking option give different start-up times as shown in Table 5 on page 14. Internal RC Oscillator The internal RC oscillator option is an on-chip calibrated oscillator running at a nominal frequency of 1.2 MHz. If selected, the device can operate with no external components. The device is shipped with this option selected. 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 2. Either a quartz crystal or a ceramic resonator may be used. When the INTCAP fuse is programmed, internal load capacitors with typical values 50 pF are connected between XTAL1/XTAL2 and ground. Figure 2. Oscillator Connections Note: 1. When using the MCU oscillator as a clock for an external device, an HC buffer should be connected as indicated in the figure. Table 1. Device Clocking Option Select Clock Option CKSEL3..0 External Crystal/Ceramic Resonator 1111 - 1010 External Low-frequency Crystal 1001 - 1000 External RC Oscillator 0111 - 0101 Internal RC Oscillator 0100 - 0010 External Clock 0001 - 0000 XTAL2 XTAL1 GND C2 C1 MAX 1 HC BUFFER HC |
Similar Part No. - ATTINY28V-1PC |
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Similar Description - ATTINY28V-1PC |
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