ST10F166 datasheet(44/62 Pages) STMICROELECTRONICS

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ST10F166

AC Characteristics (Cont’d)

External Clock Drive XTAL1 for the ST10F166-16

CC =5 V

± 10 %;V

SS =0V

A = 0 to +70

°C

Note: In order to run the ST10F166-16 at a CPU clock of 20 MHz the duty cycle of the oscillator clock must

be 0.5, ie. the relation between the oscillator high and low phases must be 1:1. So the variation of the

duty cycle of the oscillator clock limits the maximum operating speed of the device.

The 16 MHz values in the tables are given as an example for a typical duty cycle variation of the

oscillator clock from 0.4 to 0.6.

Figure 14. External Clock Drive XTAL1

Parameter

Symbol

CPU Clock = 16 MHz

Duty cycle 0.4 to 0.6

Variable CPU Clock

1/CLP = 1 to 20 MHz

Unit

min.

max.

min.

max.

Oscillator period

CLP

62.5

1000

High time

TCL

–

CLP-TCL

Low time

TCL

–

CLP-TCL

Rise time

–

Fall time

–

Oscillator duty cycle

0.4

0.6

25 / CLP

1 - 25 / CLP

Clock cycle

TCL

37.5

CLP * DCmin

CLP * DCmax

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