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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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SIM800 数据表(PDF) 176 Page - SIMCom |
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SIM800 数据表(HTML) 176 Page - SIMCom |
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176 / 380 page  Smart Machine Smart Decision SIM800 Series_AT Command Manual_V1.09 176 2015-08-03 Max Response Time - Reference Note Scope of parameter <GPIO> is different among SIM800 series project, please refer to chapter 21 for details. 6.2.41 AT+SPWM Generate the Pulse-Width-Modulation AT+SPWM Generate the Pulse-Width-Modulation Response +SPWM: (list of supported <index>s),(list of supported <freq>s),(list of supported <level>s) OK Test Command AT+SPWM=? Parameters See Write Command Response OK If error is related to ME functionality: +CME ERROR: <err> Write Command AT+SPWM=<in dex>,<freq>,<lev el> Parameters <index> Integer type: the index number of PWM port, which value is 0-2; Current only support one channel,whether 0 or 1 or 2,the PWM port is the same. 0 For buzzer (according to the hardware support or not). 1 Corresponding to PWM_OUT0 in the hardware circuit 2 Corresponding to PWM_OUT1 in the hardware circuit <freq> The range of <freq> is 0-100000, the output frequency equals to CLK/(PWM_CNT+1),where PWM_CNT=CLK/ period-1. <level> Duty ratio = PWM_THRES/( PWM_CNT+1) Parameter Saving Mode NO_SAVE Max Response Time - Reference Note The PWM clock source is 13MHz, the equation of the final frequency is: frequency = CLK/(PWM_CNT+1), where PWM_CNT = CLK/freq – 1. However, the equation can not be simplified. PWM_THRES should be less than the PWM_CNT. If freq euals 0, the output of PWM is in low state. 6.2.42 AT+ECHO Echo Cancellation Control AT+ECHO Echo Cancellation Control Test Command Response |
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