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ST52T301 bảng dữ liệu(PDF) 27 Page - STMicroelectronics

tên linh kiện ST52T301
Giải thích chi tiết về linh kiện  8-Bit OTP/EPROM DuaLogic] MCUs WITH ADC, UART, TIMER, TRIAC & PWM DRIVER
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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ST52T301 bảng dữ liệu(HTML) 27 Page - STMicroelectronics

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5 CLOCK
ST52x301 can work by using a 5, 10 or 20 MHz
clock.
The ST52x301 Clock Generator module generates
the internal clock for the internal Control Unit, ALU,
Fuzzy Core and on-chip peripherals and it is
designed to require a minimum of exte rnal
components.
The system clock may be generatedby using either
a qua r tz cr ystal , or a cera mic res onat or
(CERALOC); or, at least, by means of an external
clock.
The different clock generator options connection
methods are shown in Figure 5.1.
When an external clock is used, it must be
connectedon the pin OSCin while OSCout must be
grounded.
The crystal oscillator start-up time is a function of
manyvariables:crystal parameters(especially RS),
oscillator load capacitance (CL), IC parameters,
ambient temperature, supply voltage.
It must be observed that the crystal or ceramic
leads and circuit connections must be as short as
possible. Typical values for CL1, CL2 are 10pF for
a 20 MHz crystal.
Figure 5.1. Oscillator Connections
27/99
ST52T301/E301



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