PIC18CXX2_13 Datasheet, PDF (197/304 Pages) Microchip Technology – High Performance Microcontrollers with 10-bit A/D

PIC18CXX2
BNC
Branch if Not Carry
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
[ label ] BNC n
-128  n  127
if carry bit is ’0’
(PC) + 2 + 2n  PC
None
1110 0011 nnnn nnnn
If the Carry bit is ’0’, 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
Cycles:
1(2)
Q Cycle Activity:
If Jump:
Q1
Q2
Decode
Read literal
'n'
No
operation
No
operation
If No Jump:
Q1
Q2
Decode
Read literal
'n'
Q3
Process
Data
No
operation
Q3
Process
Data
Q4
Write to PC
No
operation
Q4
No
operation
Example:
HERE
Before Instruction
PC
=
After Instruction
If Carry =
PC
=
If Carry 
PC
=
BNC Jump
address (HERE)
0;
address (Jump)
1;
address (HERE+2)
BNN
Branch if Not Negative
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
[ label ] BNN n
-128  n  127
if negative bit is ’0’
(PC) + 2 + 2n  PC
None
1110 0111 nnnn nnnn
If the Negative 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
Cycles:
1(2)
Q Cycle Activity:
If Jump:
Q1
Q2
Decode
Read literal
'n'
No
operation
No
operation
If No Jump:
Q1
Q2
Decode
Read literal
'n'
Q3
Process
Data
No
operation
Q3
Process
Data
Q4
Write to PC
No
operation
Q4
No
operation
Example:
HERE
Before Instruction
PC
=
After Instruction
If Negative 
PC
=
If Negative =
PC
=
BNN Jump
address (HERE)
0;
address (Jump)
1;
address (HERE+2)
 1999-2013 Microchip Technology Inc.
DS39026D-page 197