DM163045 Microchip Technology, DM163045 Datasheet - Page 46

• Manufacturer Part Number: DM163045
• Description: PICDEM Lab Development Kit (with PICkit 3) General Purpose
• Manufacturer: Microchip Technology
• Series: PICDEM™r
• Type: MCUr

Specifications of DM163045

• Contents: Board, PIC kit 3
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: PIC Micro® MCU

PICDEM
DS41369A-page 42
TM
FIGURE 3-21:
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.
Lab Development Board User’s Guide
TMR0 preload value determined as follows:
Desired Timer0 Overflow Rate = (4/F
5mS = 1μSeconds x (256 – TMR0 preload value) x 32
TMR0 preload value = 256 –
Timer0 configured in the Initialize() as fol-
lows:
• Using the internal F
• TMR0 increments on low-to-high transition
• Prescaler configured for 1:32
source
of F
OSC
/4
OSC
DELAY_5MS() SOFTWARE FLOWCHART FOR LAB 5
/4 (4MHz/4) clock
1μSeconds x 32
OSC
5mS
) x number of counts to overflow x prescaler
= 99.75 rounded to 100
Clear the Timer0 overflow
Preload the Timer0 result
register (TMR0) with 100
(i.e., TMR0 overflow)
Delay_5mS()
flag (T0IF)
T0IF = 1
END
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© 2009 Microchip Technology Inc.
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