Atmel C51 Manual descarregar pdf (Página 70)

Common Features Description

Atmel 8051 Microcontrollers Hardware Manual 2-70

4316E–8051–01/07

RCAP2H and RCAP2L hold the reload value for this mode. More about Timer 2’s fea-

tures in Section 1.6.

2.2.10 Control Registers Special Function Registers IP, IE, TMOD, TCON, T2CON, SCON, and PCON contain

control and status bits for the interrupt system, the timer/counters, and the serial port.

They are described in later sections.

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

This section not yet available.

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Atmel C51 Manual Página 70