ST7MC1K2 datasheet(44/371 Pages) STMICROELECTRONICS

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6.3

Oscillator

The main clock of the ST7 can be generated by a crystal or ceramic resonator oscillator or

an external source.

The associated hardware configurations are shown in Table 6. Refer to the electrical

characteristics section for more details.

6.3.1

External clock source

In this external clock mode, a clock signal (square, sinus or triangle) with ~50% duty cycle

has to drive the OSC1 pin while the OSC2 pin is not connected.

Crystal/ceramic oscillators

This family of oscillators has the advantage of producing a very accurate rate on the main

clock of the ST7. In this mode, the resonator and the load capacitors have to be placed as

close as possible to the oscillator pins in order to minimize output distortion and start-up

stabilization time.

This oscillator is not stopped during the reset phase to avoid losing time in its start-up

phase. See Section 12: Electrical characteristics for more details.

Note:

When crystal oscillator is used as a clock source, a risk of failure may exist if no series

resistors are implemented.

Table 6.

ST7 clock sources

Hardware configuration

OSC1

OSC2

External

ST7

source

OSC1

OSC2

Load

capacitors

ST7

CL2

CL1

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