参数资料
型号: ST72141K2B3/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, PLASTIC, SDIP-32
文件页数: 50/133页
文件大小: 2615K
代理商: ST72141K2B3/XXX
Obsolete
Product(s)
- Obsolete
Product(s)
ST72141K2
23/133
3.3 LOW CONSUMPTION OSCILLATOR
The main clock of the ST7 can be generated by
two different sources:
an external source
a crystal or ceramic resonator oscillators
External Clock Source
In this mode, a square clock signal with ~50% duty
cycle has to drive the OSC2 pin while the OSC1
pin is tied to VSS (see Figure 15).
Figure 15. External Clock
Crystal/Ceramic Oscillators
This oscillator (based on constant current source)
is optimized in terms of consumption and has the
advantage of producing a very accurate rate on
the main clock of the ST7.
When using this oscillator, the resonator and the
load capacitances have to be connected as shown
in Figure 16 and have to be mounted as close as
possible to the oscillator pins in order to minimize
output distortion and start-up stabilization time.
This oscillator is not stopped during the RESET
phase to avoid losing time in the oscillator start-up
phase.
Figure 16. Crystal/Ceramic Resonator
OSC1
OSC2
EXTERNAL
ST7
SOURCE
OSC1
OSC2
LOAD
CAPACITANCES
ST7
CL1
CL0
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