PIC18F258 MICROCHIP [Microchip Technology], PIC18F258 Datasheet - Page 293

• Manufacturer Part Number: PIC18F258
• Description: High Performance, 28/40-Pin Enhanced FLASH Microcontrollers with CAN
• Manufacturer: MICROCHIP [Microchip Technology]

BTG
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
Q Cycle Activity:
2002 Microchip Technology Inc.
Before Instruction:
After Instruction:
Decode
PORTC =
PORTC =
Q1
register ’f’
Bit Toggle f
[ label ] BTG f,b[,a]
0
0
a
(f<b>)
None
Bit ’b’ in data memory location ’f’ is
inverted. If ‘a’ is 0, the Access Bank
will be selected, overriding the BSR
value. If ‘a’ = 1, then the bank will be
selected as per the BSR value
(default).
1
1
BTG
Read
0111
Q2
0111 0101 [0x75]
0110 0101 [0x65]
f
b
[0,1]
255
7
PORTC,
f<b>
bbba
Process
Data
Q3
4
ffff
register ’f’
Write
Q4
ffff
BOV
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 Overflow
If Overflow
No
Q1
Q1
PC
PC
Read literal
Read literal
operation
Branch if Overflow
[ label ] BOV
-128
if overflow bit is ’1’
(PC) + 2 + 2n
None
If the Overflow 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.
1
1(2)
HERE
1110
No
Q2
Q2
’n’
’n’
=
=
=
=
=
PIC18FXX8
n
address (HERE)
1;
address (JUMP)
0;
address (HERE+2)
127
0100
BOV
operation
Process
Process
Data
Data
No
Q3
Q3
n
DS41159B-page 291
PC
JUMP
nnnn
Write to PC
operation
operation
No
No
Q4
Q4
nnnn