PIC18F258 MICROCHIP [Microchip Technology], PIC18F258 Datasheet - Page 294

• Manufacturer Part Number: PIC18F258
• Description: High Performance, 28/40-Pin Enhanced FLASH Microcontrollers with CAN
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18FXX8
BZ
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
DS41159B-page 292
Q Cycle Activity:
If Jump:
If No Jump:
Before Instruction
After Instruction
operation
Decode
Decode
PC
If Zero
If Zero
No
Q1
Q1
PC
PC
Read literal
Read literal
operation
Branch if Zero
[ label ] BZ
-128
if Zero bit is ’1’
(PC) + 2 + 2n
None
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)
HERE
1110
No
Q2
Q2
’n’
’n’
=
=
=
=
=
n
address (HERE)
1;
address (Jump)
0;
address (HERE+2)
127
0000
operation
BZ
Process
Process
n
Data
Data
No
Q3
Q3
PC
Jump
nnnn
Write to PC
operation
operation
No
No
Q4
Q4
nnnn
CALL
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
1st word (k<7:0>)
2nd word(k<19:8>)
Description:
Words:
Cycles:
Example:
Q Cycle Activity:
Before Instruction
After Instruction
operation
Decode
PC
PC
TOS
WS
BSRS
STATUSS=
No
Q1
Read literal
=
=
=
=
=
operation
’k’<7:0>,
Subroutine Call
[ label ] CALL k [,s]
0
s
(PC) + 4
k
if s = 1
(W)
(STATUS)
(BSR)
None
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.
2
2
HERE
1110
1111
No
Q2
address (HERE)
address (THERE)
address (HERE + 4)
W
BSR
STATUS
k
[0,1]
PC<20:1>,
2002 Microchip Technology Inc.
WS,
1048575
BSRS
k
110s
Push PC to
CALL
19
TOS,
operation
kkk
STATUSS,
stack
No
Q3
THERE,FAST
k
kkkk
7
kkk
Write to PC
Read literal
’k’<19:8>,
operation
Q4
No
kkkk
kkkk
0
8