參數(shù)資料
型號： ST72C171K2
廠商： 意法半導體
英文描述： 8-BIT MCU WITH 8K FLASH. ADC. WDG. SPI. SCI. TIMERS SPGAS (SOFTWARE PROGRAMMABLE GAIN AMPLIFIERS). OP-AMP
中文描述： 8位8K閃存微控制器。 ADC的。水分散粒劑。的SPI。脊髓損傷。定時器SPGAS（軟件可編程增益放大器）。運放
文件頁數(shù)： 20/152頁
文件大小： 1384K
代理商： ST72C171K2
ST72C171
20/152
MULTIOSCILLATOR (MO)
(Cont’d)
External RC Oscillator
This oscillator allows a low cost solution on the
main clock of the ST7 using only an external resis-
tor and an external capacitor (see
Figure 15
). The
selection of the external RC oscillator has to be
done by Option Byte.
The frequency of the external RC oscillator is fixed
by the resistor and the capacitor values:
The previous formula shows that in this MO mode,
the accuracy of the clock is directly linked to the
accuracy of the discrete components.
Figure 15. MO External RC
Internal RC Oscillator
The Internal RC oscillator mode is based on the
same principle as the External RC one including
the an on-chip resistor and capacitor. This mode is
the most cost effective one with the drawback of a
lower frequency accuracy. Its frequency is in the
range of several MHz.
In this mode, the two oscillator pins have to be tied
to ground as shown in
Figure 16
.
The selection of the internal RC oscillator has to
be done by Option Byte.
Figure 16. MO Internal RC
f
OSC
~
N
R
EX
. C
EX
OSCin
OSCout
ST7
C
EX
R
EX
OSCin
OSCout
ST7
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ST72C215G2M5 制造商:STMicroelectronics 功能描述:MCU 8BIT ST7 CISC 8KB FLASH 3.3V/5V 28SOIC - Rail/Tube
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