PIC18F242 MICROCHIP [Microchip Technology], PIC18F242 Datasheet - Page 228

• Manufacturer Part Number: PIC18F242
• Description: 28/40-pin High Performance, Enhanced FLASH Microcontrollers with 10-Bit A/D
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18FXX2
BZ
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
DS39564C-page 226
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 pro-
gram 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]
© 2006 Microchip Technology Inc.
PC<20:1>,
WS,
1048575
BSRS
k
110s
Push PC to
CALL
19
TOS,
operation
kkk
STATUSS,
stack
No
Q3
THERE,1
k
kkkk
7
kkk
Read literal
Write to PC
’k’<19:8>,
operation
No
Q4
kkkk
kkkk
0
8