ST10F166 datasheet(43/62 Pages) STMICROELECTRONICS

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ST10F166

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18.7 AC Characteristics

The specification of the timings depends on the CPU clock signal that is used in the

respective device. In this regard the specification for the ST10F166 and the

ST10F166-16 are different. While the ST10F166-16 directly uses the clock signal fed

to XTAL1 and therefore has to take into account the duty cycle variation of this signal,

the ST10F166 derives its CPU clock from the XTAL1 signal via a 2:1 prescaler and

therefore is independant from these variations.

For these reasons the following pages provide the timing specifications for ST10F166

and for ST10F166-16 separately (where applicable).

External Clock Drive XTAL1 for the ST10F166

CC =5 V ± 10 %;

SS =0V

A = 0 to +70

°C

Figure 13. External Clock Drive XTAL1

Parameter

Symbol

Max. CPU Clock

=20 MHz

Variable CPU Clock

1/2TCL = 1 to 20 MHz

Unit

min.

max.

min.

max.

Oscillator period

TCL

500

High time

–

Low time

–

Rise time

–

Fall time

–

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