PIC18F6585/8585/6680/8680
DS30491C-page 380
2004 Microchip Technology Inc.
BZ
Branch if Zero
Syntax:
[ label ] BZ
n
Operands:
-128
≤ n ≤ 127
Operation:
if Zero bit is ‘1’
(PC) + 2 + 2n
→ PC
Status Affected:
None
Encoding:
1110
0000
nnnn
Description:
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.
Words:
1
Cycles:
1(2)
Q Cycle Activity:
If Jump:
Q1
Q2
Q3
Q4
Decode
Read literal
‘n’
Process
Data
Write to PC
No
operation
No
operation
No
operation
No
operation
If No Jump:
Q1
Q2
Q3
Q4
Decode
Read literal
‘n’
Process
Data
No
operation
Example:
HERE
BZ
Jump
Before Instruction
PC
=
address (HERE)
After Instruction
If Zero
=
1;
PC
=
address (Jump)
If Zero
=
0;
PC
=
address (HERE+2)
CALL
Subroutine Call
Syntax:
[ label ] 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>)
1110
1111
110s
k19kkk
k7kkk
kkkk
kkkk0
kkkk8
Description:
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
Q2
Q3
Q4
Decode
Read literal
‘k’<7:0>,
Push PC to
stack
Read literal
‘k’<19:8>,
Write to PC
No
operation
No
operation
No
operation
No
operation
Example:
HERE
CALL
THERE,1
Before Instruction
PC
=
address (HERE)
After Instruction
PC
=
address (THERE)
TOS
=
address (HERE + 4)
WS
=
W
BSRS
=
BSR
STATUSS =
STATUS
相关PDF资料
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