PIC18F2525_08 Datasheet, PDF (284/412 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC18F2525/2620/4525/4620
BZ
Branch if Zero
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
If Jump:
Q1
Decode
No
operation
If No Jump:
Q1
Decode
BZ n
-128 ≤ n ≤ 127
if Zero bit is ‘1’,
(PC) + 2 + 2n → PC
None
1110 0000 nnnn nnnn
If the Zero bit is ‘1’, then the program
will branch.
The 2’s complement number ‘2n’ is
added to the PC. Since the PC will
have incremented to fetch the next
instruction, the new address will be
PC + 2 + 2n. This instruction is then a
two-cycle instruction.
1
1(2)
Q2
Read literal
‘n’
No
operation
Q3
Process
Data
No
operation
Q4
Write to PC
No
operation
Q2
Read literal
‘n’
Q3
Process
Data
Q4
No
operation
Example:
HERE
Before Instruction
PC
=
After Instruction
If Zero
=
PC
=
If Zero
=
PC
=
BZ Jump
address (HERE)
1;
address (Jump)
0;
address (HERE + 2)
CALL
Subroutine Call
Syntax:
CALL k {,s}
Operands:
0 ≤ k ≤ 1048575
s ∈ [0,1]
Operation:
(PC) + 4 → TOS,
k → PC<20:1>;
if s = 1,
(W) → WS,
(STATUS) → STATUSS,
(BSR) → BSRS
Status Affected:
None
Encoding:
1st word (k<7:0>)
2nd word(k<19:8>)
Description:
1110 110s k₇kkk kkkk₀
1111 k₁₉kkk kkkk kkkk₈
Subroutine call of entire 2-Mbyte
memory range. First, return address
(PC + 4) is pushed onto the return
stack. If ‘s’ = 1, the W, STATUS and
BSR registers are also pushed into their
respective shadow registers, WS,
STATUSS and BSRS. If ‘s’ = 0, no
update occurs (default). Then, the
20-bit value ‘k’ is loaded into PC<20:1>.
CALL is a two-cycle instruction.
Words:
2
Cycles:
2
Q Cycle Activity:
Q1
Decode
No
operation
Q2
Q3
Read literal PUSH PC to
‘k’<7:0>,
stack
No
operation
No
operation
Q4
Read literal
‘k’<19:8>,
Write to PC
No
operation
Example:
HERE
CALL THERE, 1
Before Instruction
PC
=
After Instruction
PC
=
TOS =
WS
=
BSRS =
STATUSS =
address (HERE)
address (THERE)
address (HERE + 4)
W
BSR
STATUS
DS39626E-page 282
© 2008 Microchip Technology Inc.