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Digital frequency meter by PIC microcontroller using timer 1 (0-9999 Hz) ... with The Energy Detective using pic microcontoller PIC12F675 interrupt based software UART code and Proteus simulation ... The device can be woken up by an external reset, a watch-dog timer reset, an interrupt on INT0 pin, or port-on-change interrupt. In this experiment, we will discuss how to put a PIC microcontroller into Sleep mode and compare the current consumption during Sleep mode and the normal operation mode.
So a 16bit Timer will roll over, giving an interrupt every 0.065536 Seconds. Preload the Timer with 0x3cB0 [15526 deci] to give a 'close' 50mSec. Consider the additional time required to execute the supporting program code. Eric EDIT: See that Brian has just pipped me at the post.The core interrupts, for the INT input, changes on PortA pin levels, and the T0 timer, have only their individual interrupt enables. In the initialization section of a program, the interrupt enable bits for the desired interrupts are set, and any necessary configuration should be done. - External and Internal Interrupt Sources - Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended Standby I/O and Packages - 32 Programmable I/O Lines - 40-pin PDIP, 44-lead TQFP, and 44-pad MLF Operating Voltages - 4.5-5.5V for ATmega16 Speed Grades - 0-16 MHz for ATmega16 Power Consumption at 4 Mhz, 3V, 35 °C
PIC12F629/675DS41190C-page 58 2003 Microchip Technology Inc.TABLE 9-3:TIME-OUT IN VARIOUS SITUATIONSTABLE 9-4:STATUS/PCON BITS AND THEIR SIGNIFICANCETABLE 9-5:SUMMARY OF REGISTERS ASSOCIATED WITH BROWN-OUTTABLE 9-6: datasheet search, datasheets, Datasheet search site for Electronic Components and Semiconductors, integrated circuits, diodes and other semiconductors. 1. put the TMR1 interrupt check first and the INT second, this will give priority to the timer. 2. Just set a bit/flag in the ISR, reset the timer then exit as soon as possible, move all the processing code inside the 'while()' loop. Brian.