DM164120-2 Microchip Technology, DM164120-2 Datasheet - Page 35

• Manufacturer Part Number: DM164120-2
• Description: BOARD DEMO PICKIT 2 44PIN
• Manufacturer: Microchip Technology
• Type: MCUr

Specifications of DM164120-2

• Contents: 3 Boards (1 Populated, 2 Bare)
• Processor To Be Evaluated: PIC16F
• Silicon Manufacturer: Microchip
• Kit Contents: PIC16F Device, 2 PCB Boards
• Features: Small Surface Mount Prototype Area, Two Bare PCB Boards
• Development Tool Type: Hardware - Daughter Card
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: PIC16F887
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

© 2007 Microchip Technology Inc.
EXAMPLE 3-10:
Lesson 11 adds a Moving Average Filter to the Analog-to-Digital code in Lesson 4.
Turning the potentiometer changes the value read by the Analog-to-Digital converter.
The averaged value is then sent to the LED display. The averaging filter only runs every
0.2 seconds to slow down the display changes and make it visible. The display appears
to count from the old potentiometer position to the new position.
The filter averages the last 8 readings. Choosing a power of two for the number of sam-
ples allows division by simple rotates instead of having to use a true division routine.
Additionally, rather than summing the array every time, it’s faster to keep a running
sum, then subtract out the oldest value in the queue and adding in the new value.
INCF
;insert new value into a queue, enter with new value in
;Wreg
MOVF
MOVF
MOVWF
MOVF
MOVWF
QueuePointer, f
temp
QueuePointer,w
FSR
temp,w
INDF
FILE SELECT REGISTER EXAMPLE
44-Pin Demo Board Lessons
;Advance the pointer
;save the latest value
;load FSR with the queue pointer
;Write the new value to the queue
DS41296B-page 31