PIC18F2420-I/SOC01 Microchip, PIC18F2420-I/SOC01 Datasheet - Page 280

• Manufacturer Part Number: PIC18F2420-I/SOC01
• Description: 28 pin, 16 kb flash, 3804 ram, 25 i/o...
• Manufacturer: Microchip

PIC18F2420/2520/4420/4520
BNOV
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
DS39631E-page 278
Q Cycle Activity:
If Jump:
If No Jump:
Before Instruction
After Instruction
operation
Decode
Decode
PC
If Overflow
If Overflow
Q1
No
Q1
PC
PC
Read literal
Read literal
operation
Branch if Not Overflow
BNOV
-128 ≤ n ≤ 127
if Overflow bit is ‘0’,
(PC) + 2 + 2n → PC
None
If the Overflow bit is ‘0’, 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
Q2
Q2
No
‘n’
‘n’
=
=
=
=
=
address (HERE)
0;
address (Jump)
1;
address (HERE + 2)
n
0101
BNOV Jump
operation
Process
Process
Data
Data
Q3
No
Q3
nnnn
Write to PC
operation
operation
Q4
Q4
No
No
nnnn
BNZ
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
Q Cycle Activity:
If Jump:
If No Jump:
Before Instruction
After Instruction
operation
Decode
Decode
PC
If Zero
If Zero
Q1
No
Q1
PC
PC
Read literal
Read literal
operation
Branch if Not Zero
BNZ
-128 ≤ n ≤ 127
if Zero bit is ‘0’,
(PC) + 2 + 2n → PC
None
If the Zero bit is ‘0’, 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
Q2
No
Q2
‘n’
‘n’
=
=
=
=
=
© 2008 Microchip Technology Inc.
n
address (HERE)
0;
address (Jump)
1;
address (HERE + 2)
0001
BNZ
operation
Process
Process
Data
Data
Q3
No
Q3
Jump
nnnn
Write to PC
operation
operation
Q4
No
Q4
No
nnnn