(68)--CH2-9 8051 Microcontroller Power嵌入式系统原理.ppt

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1、第第2 2章章 单片机原理与应用单片机原理与应用Principles Principles and Applications of and Applications of MicrocontrollerMicrocontrollerChapter 2.9 Power Consumption Control(1)Normal Mode:25mA(2)Idle Mode:6.5mA(3)Power Down Mode:40uAThree working mode：Chapter 2.9 Power Consumption Control(1)Idle Mode In idle mode,CPU i

2、s stopped,all the interrupt are active.When any interrupt occurs,CPU will wake up.Set PCON bit0(ie.IDL)to 1,CPU enter idle mode.Chapter 2.9 Power Consumption ControlFor example:In the program of timer 1 interruptvoid main()TMOD=0 x11;TH1=0 xdc;TL1=0 x00;/11.0592MHz/12=921600,10ms needs 9216 pulses,T

3、=65536-9216IE=0 x88;/Enable Timer1 and UART interruptTCON=0 x08;ssbuf=0 x00;/Initial valuebuff=100;TR1=1;/Start timer1loop1:IDL=1;goto loop1;/Nothing to do Chapter 2.9 Power Consumption Control(2)Power Down Mode In this mode,all the parts of MCU are stopped.Only RESET can get CPU to normal mode.The content of internal RAM is saved.Set PCON bit1(ie.PD)to 1,CPU enter Power Down mode.Chapter 2.9 Power Consumption ControlSummary：3 working mode:(1)Normal Mode:25mA(2)Idle Mode:6.5mA(3)Power Down Mode:40uASet PCONs bit IDL/PD to select mode.