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ST10F166 Datasheet(PDF) 43 Page - STMicroelectronics

Part # ST10F166
Description  16-BIT MCU WITH 256K FLASH MEMORY
PDF  62 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST10F166 Datasheet(HTML) 43 Page - STMicroelectronics

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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
V
CC =5 V ± 10 %;
V
SS =0V
T
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
SR
25
25
25
500
ns
High time
t
1
SR
6
–
6
–
ns
Low time
t
2
SR
6
–
6
–
ns
Rise time
t3
SR
–
5
–
5
ns
Fall time
t
4
SR
–
5
–
5
ns



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