PIC18F4321 Datasheet, PDF (296/396 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC18F4321 FAMILY
GOTO
Unconditional Branch
Syntax:
GOTO k
Operands:
0 ≤ k ≤ 1048575
Operation:
k → PC<20:1>
Status Affected:
None
Encoding:
1st word (k<7:0>)
2nd word(k<19:8>)
Description:
1110 1111 k₇kkk kkkk₀
1111 k₁₉kkk kkkk kkkk₈
GOTO allows an unconditional branch
anywhere within entire
2-Mbyte memory range. The 20-bit
value ‘k’ is loaded into PC<20:1>.
GOTO is always a two-cycle
instruction.
Words:
2
Cycles:
2
Q Cycle Activity:
Q1
Decode
No
operation
Q2
Read literal
‘k’<7:0>,
No
operation
Q3
No
operation
No
operation
Q4
Read literal
‘k’<19:8>,
Write to PC
No
operation
Example:
GOTO THERE
After Instruction
PC = Address (THERE)
INCF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Q1
Decode
Increment f
INCF f {,d {,a}}
0 ≤ f ≤ 255
d ∈ [0,1]
a ∈ [0,1]
(f) + 1 → dest
C, DC, N, OV, Z
0010 10da ffff ffff
The contents of register ‘f’ are
incremented. If ‘d’ is ‘0’, the result is
placed in W. If ‘d’ is ‘1’, the result is
placed back in register ‘f’ (default).
If ‘a’ is ‘0’, the Access Bank is selected.
If ‘a’ is ‘1’, the BSR is used to select the
GPR bank (default).
If ‘a’ is ‘0’ and the extended instruction
set is enabled, this instruction operates
in Indexed Literal Offset Addressing
mode whenever f ≤ 95 (5Fh). See
Section 24.2.3 “Byte-Oriented and
Bit-Oriented Instructions in Indexed
Literal Offset Mode” for details.
1
1
Q2
Read
register ‘f’
Q3
Process
Data
Q4
Write to
destination
Example:
INCF
Before Instruction
CNT
Z
C
DC
= FFh
=0
=?
=?
After Instruction
CNT
Z
C
DC
= 00h
=1
=1
=1
CNT, 1, 0
DS39689E-page 294
Preliminary
© 2007 Microchip Technology Inc.