參數(shù)資料
型號： ST7FLCD1G9M1
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDSO28
封裝： ROHS COMPLIANT, SO-28
文件頁數(shù)： 26/96頁
文件大?。?/td> 846K
代理商： ST7FLCD1G9M1
Clocks & Low Power Modes
ST7FLCD1
6
Clocks & Low Power Modes
6.1
Clock System
6.1.1
General Description
The device requires a certain number of clock signals in order to operate. All clock signals are
derived from the root clock signal CkXT provided at the output of the "OSC" circuit (refer to
Figure 13). If a crystal oscillator or ceramic resonator is applied on pins OSCIN and OSCOUT, the
OSC operates in a crystal-controlled oscillator mode. An external clock signal can also be applied
on the OSCIN pin, putting the OSC in external clock mode operation.
The block diagram in Figure 13 shows the basic configuration of the clock system.
6.1.2
Crystal Oscillator Mode
In this mode, the root clock is generated by the on-chip oscillator controlled by an external parallel
fundamental-mode crystal oscillator or a ceramic resonator. General design precautions must be
followed to ensure maximum stability. Foot capacitors CL1 and CL2 must be adapted to match the
crystal oscillator or ceramic resonator. A 100-k
resistor is internally connected between pins
OSCIN and OSCOUT.
Note:
If a Murata ceramic resonator is to be used, Murata recommends their CERALOCK CSTCG-
series (fundamental type) with built-in CL1 and CL2 capacitors, such as:
- CSTCG24M0V51-R0 for 24-MHz external, 8-MHz internal clock operation
- CSTCG27M0V51-R0 for 27-MHz external, 9-MHz internal clock operation
No additional external capacitor is therefore needed with either model of this series.
6.1.3
External Clock Mode
In this mode, an external clock is provided on pin OSCIN, while pin OSCOUT is left open. The
signal is internally buffered before feeding the subsequent stages. There is the same emphasis on
stability of the external clock as in Crystal Oscillator mode.
Figure 13: Main Clock Generation
OSC
OSCIN
OSCOU
T
VS
S
CkXT
OSC
OSCIN
OSCOU
T
VS
S
CkXT
External
Clock
Crystal Oscillator Mode
External Clock Mode
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