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44-Pin Demo Board User’s Guide
Increment or Decrement a File Register
The INCFSZ and DECFSZ instructions add or subtract one from the contents of
the file register and skips the next instruction when the result is zero. One use is
in the delay loop as shown in Example 3-3.
CLRF Clears the counter location.
DECFSZ Decrements the location, and if the result is zero, the next instruction is
skipped.
EXAMPLE 3-3:
Short Loop
CLRF
Loop
DECFSZ
GOTO
Long Loop
CLRF
CLRF
Loop
DECFSZ
GOTO
DECFSZ
GOTO
DELAY LOOP
Delay
Delay,f
Loop
Delay1
Delay2
Delay1,f
Loop
Delay2,f
Loop
The GOTO Loop (in Example 3-3) backs up and does it again. This loop takes 3
instruction times; one for the decrement and two for the GOTO (see note) and the
counter will force it to go around 256 times, which takes it a total of 768 instruction times
(768 μ s) to execute.
Even that is still too fast for the eye to see. It can be slowed down even more by adding
a second loop around this one.
The inner loop still takes 768 μ s plus 3 for the outer loop, but now it’s executed another
256 times, (768 + 3) * 256 = 197376 μ s = 0.197s.
Note:
GOTO instructions take two instructions due to the pipelined design of the
processor. The processor fetches the next instruction while executing the
current instruction. When a program branch occurs, the fetched instruction
is not executed.
Open Blink.asm and build the lesson. Next, import the hex file into the PICkit 2 and
program the device. Note the LED now flashes at about a 2.5 Hz rate.
DS41296B-page 16
? 2007 Microchip Technology Inc.
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