參數(shù)資料
型號(hào)： EM785842P
廠商： ELAN Microelctronics Corp .
英文描述： 8-BIT MICRO-CONTROLLER
中文描述： 8位微控制器
文件頁數(shù)： 34/45頁
文件大?。?/td> 461K
代理商： EM785842P
EM785840/5841/5842
8-bit Micro-controller
__________________________________________________________________________________________________________________________________________________________________
* This specification is subject to change without notice.
2004/11/10 V1.2
VII.11 Oscillator
The EM785840 can be operated in two different oscillator modes, each of them are crystal mode and RC mode.
Users can select one of them by setting code option. The descript of these two oscillator mode are as below:
(1) Crystal mode:
For crystal mode operation, one crystal and tow capacitances is needed for external circuit. In this mode,
eFT5840 can be run in four active mode include normal mode, green mode and sleep mode. The advantages of this
mode are low power consumption (in green mode) and with more precise main CLK. Next figure show the
application circuit of crystal mode. Pin XIN and pin XOUT can be connected with a crystal directly to generate
oscillation. By clear code option”P70S” to 0, PORT70 can switch to general IO (disable PLL function and
EM785840 can not active on normal mode); /RESET pin can switch to PORT71 if clear “P71S” to 0.
Fig 13: Application circuit of Crystal mode
Fig 14: The relative of Crystal mode’s normal, green and sleep mode
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