PIC18F4550-IP Datasheet, PDF (336/438 Pages) Microchip Technology – 28/40/44-Pin, High-Performance, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

PIC18F2455/2550/4455/4550
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 the 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
Q2
Read literal
‘k’<7:0>,
No
operation
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 26.2.3 “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
DS39632E-page 334
© 2009 Microchip Technology Inc.