Common Features Description
Atmel 8051 Microcontrollers Hardware Manual 2-68
4316B–8051–02/04
2.3 Oscillator and
Clock Circuit
XTAL1 and XTAL2 are the input and output of a single-stage on-chip inverter, which can
be configured with off-chip components as a Pierce oscillator, as shown in Figure 2-2.
The on-chip circuitry, and selection of off-chip components to configure the oscillator are
discussed in Section 1.12.
Figure 2-2. Crystal/Ceramic Resonator Oscillator
The oscillator, in any case, drives the internal clock generator. The clock generator pro-
vides the internal clocking signals to the chip. The internal clocking signals are at half
the oscillator frequency, and define the internal phases, states, and machine cycles,
which are described in the next section.
2.3.1 More about the On-
chip Oscillator
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