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General Purpose Input/Output Labs
EQUATION 3-4:
MAXIMUM TMR0 OVERFLOW PERIOD
TMR0 Overflow Period = (4/F OSC ) x 256 x prescaler
using a maximum prescaler setting of 1:256 and the 4MHz internal oscillator
TMR0 Overflow Period = 1 μ S x 256 x 256 = 65.5mS
Therefore, to implement delays greater than 65.5mS, a counter variable is
implemented as shown in the flowchart of Figure 3-14 for a 1 second delay.
FIGURE 3-14:
DELAY_1S() USING TIMER0
Delay_1S()
Create an 8-bit variable counter and
initialize to 0
counter < or = 15?
YES
END
NO
Clear the TMR0 overflow flag
(T0IF)
Clear the TMR0 register
NO
T0IF = 0?
YES
Increment counter value by 1
counter variable value determined as follows:
1 second/65.5mS = 15.25 or rounded down to 15
? 2009 Microchip Technology Inc.
DS41369A-page 31
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