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HT82R732 Arkusz danych(PDF) 21 Page - Holtek Semiconductor Inc

Numer części HT82R732
Szczegółowy opis  e-Banking 8-Bit OTP MCU
Download  74 Pages
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Producent  HOLTEK [Holtek Semiconductor Inc]
Strona internetowa  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

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Oscillator
Various oscillator options offer the user a wide range of functions according to their application
requirements. The flexible features of the oscillator functions ensure that the best optimisation can be
achieved in terms of speed and power saving. Oscillator selections and operation are selected through
a combination of configuration options and registers.
System Oscillator Overview
In addition to being the source of the main system clock the oscillators also provide clock sources for
the Watchdog Timer and Time Base functions. An external oscillator requiring some external
components as well as two fully integrated internal oscillators, requiring no external components, are
provided to form a range of both fast and slow system oscillators.
Type
Name
Freq.
Pins
Internal High Speed RC
HIRC
4MHz
¾
External Low Speed Crystal
LXT
32768Hz
XT1/XT2
Internal Low Speed RC
LIRC
12kHz
¾
The oscillator is connected to the XT1/XT2 pins with TinyPower
TM design.
System Clock Configurations
There are three system oscillators, one high speed oscillator and two low speed oscillators. The high
speed oscillator is the internal RC oscillator -- HIRC. The two low speed oscillators are the external
32768Hz oscillator -- LXT and the internal 12kHz (VDD=5V) oscillator -- LIRC.
Internal RC Oscillator
- HIRC
The internal RC oscillator is a fully integrated system oscillator requiring no external components. The
internal RC oscillator has fixed frequency of 4MHz. Device trimming during the manufacturing
process and the inclusion of internal frequency compensation circuits are used to ensure that the
influence of the power supply voltage, temperature and process variations on the oscillation frequency
are minimised. As a result, at a power supply of either 3V or 5V and at a temperature of 25 degrees, the
fixed oscillation frequency of 4MHz will have a tolerance within 2%.
HT82R732
e-Banking 8-Bit OTP MCU
Rev. 1.00
21
October 31, 2013
4 M H z
H I R C
L I R C
L X T
3 2 k H z
1 2 k H z
f S Y S
W a t c h d o g
T i m e r
L C D
T i m e B a s e
¸ 4


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