PIC18F2450 MICROCHIP [Microchip Technology], PIC18F2450 Datasheet - Page 227

• Manufacturer Part Number: PIC18F2450
• Description: 28/40/44-Pin, High-Performance, 12 MIPS, Enhanced Flash, USB Microcontrollers with nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

BTG
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
© 2006 Microchip Technology Inc.
Q Cycle Activity:
Before Instruction:
After Instruction:
Decode
PORTC =
PORTC =
Q1
register ‘f’
BTG
Bit Toggle f
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 is selected.
If ‘a’ is ‘1’, the BSR is used to select the
GPR bank (default).
If ‘a’ is ‘0’ and the extended instruction
set is enabled, this instruction operates
in Indexed Literal Offset Addressing
mode whenever f
Section 19.2.3 “Byte-Oriented and
Bit-Oriented Instructions in Indexed
Literal Offset Mode” for details.
1
1
Read
0111
Q2
f
b < 7
0111 0101 [75h]
0110 0101 [65h]
[0,1]
255
f<b>
PORTC,
bbba
Process
Data
Q3
95 (5Fh). See
4, 0
ffff
register ‘f’
Advance Information
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
No
PC
If Overflow
If Overflow
PIC18F2450/4450
Q1
Q1
PC
PC
Read literal
Read literal
operation
Branch if Overflow
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
‘n’
Q2
‘n’
=
=
=
=
=
n
n
address (HERE)
1;
address (Jump)
0;
address (HERE + 2)
127
0100
BOV
operation
Process
Process
Data
Data
No
PC
Q3
Q3
DS39760A-page 225
Jump
nnnn
Write to PC
operation
operation
No
No
Q4
Q4
nnnn