PIC18F2331 Datasheet, PDF (297/396 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High Performance PWM and A/D

PIC18F2331/2431/4331/4431
ANDWF
AND W with f
Syntax:
[ label ] ANDWF f [,d [,a]]
Operands:
0 ≤ f ≤ 255
d ∈ [0,1]
a ∈ [0,1]
Operation:
(W) .AND. (f) → dest
Status Affected: N, Z
Encoding:
0001 01da ffff ffff
Description:
The contents of W are AND’ed with
register ‘f’. If ‘d’ is 0, the result is
stored in W. If ‘d’ is 1, the result is
stored back in register ‘f’ (default).
If ‘a’ is 0, the Access Bank will be
selected. If ‘a’ is 1, the BSR will not
be overridden (default).
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Decode
Read
register 'f'
Q3
Process
Data
Q4
Write to
destination
Example:
ANDWF
Before Instruction
W
REG
= 0x17
= 0xC2
After Instruction
W
REG
= 0x02
= 0xC2
REG, W
BC
Branch if Carry
Syntax:
[ label ] BC n
Operands:
-128 ≤ n ≤ 127
Operation:
if carry bit is ‘1’
(PC) + 2 + 2n → PC
Status Affected: None
Encoding:
1110 0010 nnnn nnnn
Description:
If the Carry 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
No
operation
If No Jump:
Read literal
‘n’
No
operation
Process
Data
No
operation
Write to PC
No
operation
Q1
Q2
Q3
Q4
Decode
Read literal
‘n’
Process
Data
No
operation
Example:
HERE
Before Instruction
PC
=
After Instruction
If Carry
=
PC
=
If Carry
=
PC
=
BC JUMP
address (HERE)
1;
address (JUMP)
0;
address (HERE+2)
 2003 Microchip Technology Inc.
Preliminary
DS39616B-page 295