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AT89C2051X2 Datasheet(PDF) 4 Page - ATMEL Corporation |
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AT89C2051X2 Datasheet(HTML) 4 Page - ATMEL Corporation |
4 / 19 page 4 AT89C2051x2 3285B–MICRO–10/03 Oscillator Characteristics XTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier which can be configured for use as an on-chip oscillator, as shown in Figure 1. Either a quartz crystal or ceramic resonator may be used. To drive the device from an external clock source, XTAL2 should be left unconnected while XTAL1 is driven as shown in Figure 2. There are no requirements on the duty cycle of the external clock signal, since the input to the internal clocking circuitry is through a divide-by-two flip-flop, but minimum and maximum voltage high and low time specifications must be observed. Figure 1. Oscillator Connections Note: C1, C2 = 30 pF ± 10 pF for Crystals = 40 pF ± 10 pF for Ceramic Resonators Figure 2. External Clock Drive Configuration X2 Mode Description The clock for the entire circuit and peripherals is normally divided by 2 before being used by the CPU core and peripherals. This allows any cyclic ratio (duty cycle) to be accepted on XTAL1 input. In X2 mode, as this divider is bypassed, the signals on XTAL1 must have a cyclic ratio (duty cycle) between 40% to 60%. Figure 3 shows the clock generation block diagram. Figure 3. Clock Generation Block Diagram ÷ 2 (XTAL1)/2 X2 Mode F OSC State Machine: 6 Clock Cycles CPU Control F XTAL XTAL1 |
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