ST7MC1K2TC datasheet(28/308 Pages) STMICROELECTRONICS

Teilenummer	ST7MC1K2TC

Bauteilbeschribung	8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, BRUSHLESS MOTOR CONTROL, FIVE TIMERS, SPI, LINSCI

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ST7MC1/ST7MC2

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6.1 OSCILLATOR

The main clock of the ST7 can be generated by a

crystal or ceramic resonator oscillator or an exter-

nal source.

The

associated

hardware

configurations

are

shown in Table 4. Refer to the electrical character-

istics section for more details.

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 connect-

ed.

Crystal/Ceramic Oscillators

This family of oscillators has the advantage of pro-

ducing 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 Electrical Characteristics for more details.

Note: When crystal oscillator is used as a clock

source, a risk of failure may exist if no series resis-

tors are implemented.

Table 4. ST7 Clock Sources

Hardware Configuration

OSC1

OSC2

EXTERNAL

ST7

SOURCE

OSC1

OSC2

LOAD

CAPACITORS

ST7

CL2

CL1

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