Maxim-integrated MAX31782 Manual do Utilizador descarregar pdf (Página 114)

Maxim Integrated 12-12

MAX31782 User’s Guide

Revision 0; 8/11

12.3 Timer B Code Examples

12.3.1 Auto-Reload Mode

Creating a 10ms interrupt (10ms at 4MHz = 40,000 clock cycles):

TB0R=40000;   //settheReloadRegister

TB0V=0x0000;  //cleartheValueRegister

TB0CN_bit.CPnRLB=0; //clearforautoreload

TB0CN_bit.ETB=1;  //enabletheinterrupt

TB0CN_bit.TRB=1;  //enabletheTimerBoperation

12.3.2 Clock Output Mode

Creating a 100kHz clock on the TBA pin:

TB0CN_bit.CPnRLB=0; //clearforreload

TB0CN_bit.TBPS=1;  //prescaler:dividesysclk/4for1MHzTimerBClock

TB0R=4;   //setfor100kHzoutputfrequency

TB0CN_bit.TBOE=1;  //enableoutputonTBApin

TB0CN_bit.TRB=1;  //enabletimeroperation

12.3.3 PWM Output Mode

Creating a 40% duty cycle 100kHz signal:

TB0CN_bit.TBPS=0;  //TimerBinputclk=sysclk

TB0R=39;   //PWMperiod=40sysclks

TB0C=16;   //dutycycle=16/40

TB0CN_bit.TBCR=1;  //settoresetmode

TB0CN_bit.TBCS=0;  //settoresetmode

TB0CN_bit.TRB=1;  //enableTimerB

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Maxim-integrated MAX31782 Manual do Utilizador Página 114