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1. Conditional Branching:

Code:
  DECFSZ      fileReg, d

Decrements file register and skip next instruction if value in file registers reaches 0.
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Code:
BNZ      Label

Branch if the value in file register is not zero, it works on zero flag in status register.
Attachment:
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Code:
BZ      Label

Branch if the value in file register is zero.
Code:
BNC      Label

Branch if no carry, if C flag in status register is zero.
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2. Unconditional Branching:
Code:
GOTO      Label


Nested Loops:
Due to the fact that registers in PIC can carry only 8 bits which means it can have numbers only from 0 to 255, and then if we have for loop greater than 255 what should we do? This is the nested loop:
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Comparing Instructions:

Code:
cpfseq f,a ; compare register f with WREG, skip if equal
cpfsgt f,a ; compare register f with WREG, skip if greater than
cpfslt f,a ; compare register f withWREG, skip if less than
decfsz f,d,a ; decrement f, skip if 0
dcfsnz f,d,a ; decrement f, skip if not 0
incfsz f,d,a ; increment f, skip if 0
infsnz f,d,a ; increment f, skip if not 0




_________________
M. S. Rakha, Ph.D.
Queen's University
Canada

Author: DrRakha
Mastermind
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