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PICDEM TM Lab Development Board User’s Guide
FIGURE 3-21:
DELAY_5MS() SOFTWARE FLOWCHART FOR LAB 5
Timer0 configured in the Initialize() as fol-
lows:
? Using the internal F OSC /4 (4MHz/4) clock
source
? TMR0 increments on low-to-high transition
of F OSC /4
? Prescaler configured for 1:32
TMR0 preload value determined as follows:
Delay_5mS()
Clear the Timer0 overflow
flag (T0IF)
Preload the Timer0 result
register (TMR0) with 100
T0IF = 1
(i.e., TMR0 overflow)
?
YES
END
NO
Desired Timer0 Overflow Rate = (4/F OSC ) x number of counts to overflow x prescaler
5mS = 1 μ Seconds x (256 – TMR0 preload value) x 32
TMR0 preload value = 256 – 5mS = 99.75 rounded to 100
1 μ Seconds x 32
The RA2 pin voltage is then checked again. If still low, a push button press is indicated
and the direction bit variable is toggled. Otherwise, the direction value stays the
same.
The Decide() then uses the current direction value to determine which direction
to shift the contents of the LED_Output global variable. The Decide() software
flowchart is shown in Figure 3-22.
DS41369A-page 42
? 2009 Microchip Technology Inc.
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