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LPC Demo Board Lessons
3.2.2
Lesson 2: Delay Loop (Blink a LED)
The first lesson showed how to turn on a LED, this lesson shows how to make it blink.
While this might seem a trivial change from Lesson 1, the reasons will soon become
apparent.
New Instructions
CLRF
INCF
DECF
INCFSZ
DECFSZ
GOTO
EXAMPLE 3-2:
Loop
Clear file register
Increment file register
Decrement file register
Increment file register, Skip next instruction if zero
Decrement file register, Skip next instruction if zero
Jump to a new location in the program
PICkit 2, LESSON 2: BLINK
BSF
BCF
GOTO
PORTC,0
PORTC,0
Loop
;turn on LED C0
;turn off LED C0
;do it again
While adding a BCF instruction and making it loop will make it blink, it will blink so fast
you won’t see it. It will only look dim. That loop requires 4 instruction times to execute.
The first instruction turns it on. The second one turns it off. The GOTO takes two instruc-
tion times, which means it will be on for 25% of the time.
As configured, the PICmicro executes 1 million instructions per second. At this rate, the
blinking needs to be slowed down so that the blinking can be seen, which can be done
by using a delay loop.
Note:
? 2005 Microchip Technology Inc.
Counting cycles – Relating clock speed to instruction speed. The processor
requires 4 clocks to execute an instruction. Since the internal oscillator as
used in these lessons runs at 4 MHz, the instruction rate is 1 MHz.
DS51556A-page 15
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