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PIC18F2331_07 Datasheet, PDF (305/400 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High Performance PWM and A/D | |||
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PIC18F2331/2431/4331/4431
BTG
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Q1
Decode
Bit Toggle f
[ label ] BTG f,b[,a]
0 ⤠f ⤠255
0â¤b<7
a â [0,1]
(f<b>) â f<b>
None
0111 bbba ffff ffff
Bit âbâ in data memory location âfâ is
inverted. If âaâ is â0â, the Access Bank will
be selected, overriding the BSR value. If
âaâ = 1, then the bank will be selected as
per the BSR value (default).
1
1
Q2
Read
register âfâ
Q3
Process
Data
Q4
Write
register âfâ
Example:
BTG
PORTC, 4
Before Instruction:
PORTC = 0111 0101 [0x75]
After Instruction:
PORTC = 0110 0101 [0x65]
BOV
Branch if Overflow
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
If Jump:
Q1
Decode
No
operation
If No Jump:
Q1
Decode
[ label ] BOV n
-128 ⤠n ⤠127
if Overflow bit is â1â,
(PC) + 2 + 2n â PC
None
1110 0100 nnnn nnnn
If the Overflow bit is â1â, then the pro-
gram will branch.
The 2âs complement number â2nâ 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)
Q2
Read literal
ânâ
No
operation
Q3
Process
Data
No
operation
Q4
Write to
PC
No
operation
Q2
Read literal
ânâ
Q3
Process
Data
Q4
No
operation
Example:
HERE
Before Instruction
PC
=
After Instruction
If Overflow =
PC
=
If Overflow =
PC
=
BOV JUMP
address (HERE)
1;
address (JUMP)
0;
address (HERE + 2)
© 2007 Microchip Technology Inc.
Preliminary
DS39616C-page 303
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