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ST72589BW bảng dữ liệu(PDF) 19 Page - STMicroelectronics

tên linh kiện ST72589BW
Giải thích chi tiết về linh kiện  8-BIT MCU WITH NESTED INTERRUPTS, DOT MATRIX LCD, ADC, TIMERS, PWM-BRM, SPI, SCI, I²C, CAN INTERFACES
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST72589BW bảng dữ liệu(HTML) 19 Page - STMicroelectronics

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3.2 LOW CONSUMPTION OSCILLATOR
The oscillator of the ST72589 and ST72389 devic-
es is a Crystal/Ceramic Resonator Oscillator. Its
architecture is based on a constant current to min-
imize the consumption. It can be used either with
an external resonator or an external source.
This oscillator allows a high accuracy to supply the
clock for the ST7 CPU and its internal peripherals.
Using a Crystal/Ceramic Resonator
The resonator and the load capacitances have to
be connected as shown in Figure 10 and have to
be mounted as close as possible to the oscillator
pins in order to minimize output distortion and
start-up stabilization time.
Figure 10. Main Crystal/Ceramic Resonator
Using an External Clock Source
In this mode, a square clock signal with ~50% duty
cycle has to drive the OSC1 pin while the OSC2
pin is tied to ground (see Figure 11).
Figure 11. Main External Clock Source
OSC1
OSC2
LOAD
CAPACITANCES
ST7
CL2
CL1
OSC1
OSC2
EXTERNAL
ST7
SOURCE



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