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T89C5121-ICSIL датащи(PDF) 21 Page - ATMEL Corporation

номер детали T89C5121-ICSIL
подробное описание детали  8-bit Microcontroller with Multi protocol SMART Card Interface
PDF  110 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T89C5121-ICSIL датащи(HTML) 21 Page - ATMEL Corporation

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21
T8xC5121
4164E–SCR–02/04
Clock Management
In order to optimize the power consumption and the execution time needed for a specific
task, an internal prescaler feature and a X2 feature have been implemented between
the oscillator and the CPU.
Functional Block
Diagram
Figure 10. Clock Generation Diagram
If CKRL<>7 then:
If CKRL = 7 then:
CKRL
Prescalor Factor
71
62
54
46
38
210
112
014
1
2
F
OSC
1
2(7-CKRL)
CKRL = 7
X2
FCLK_Periph
FCLK_CPU
CKCON0
CKRL
FOSC
2
x2
0
1
0
1
Osc.
XTAL1
XTAL2
F
CLK
CPU
–
F
OSC
2 x2
()
-----------------
x
1
2 7
CKRL
–
()
-----------------------------------
=
F
CLK
CPU
–
Fosc
2x2
--------------
=



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