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PIC18F4520E/MLQTP 데이터시트(PDF) 279 Page - Microchip Technology

부품명 PIC18F4520E/MLQTP
상세설명  28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
PDF  390 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F4520E/MLQTP 데이터시트(HTML) 279 Page - Microchip Technology

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 2004 Microchip Technology Inc.
Preliminary
DS39631A-page 277
PIC18F2420/2520/4420/4520
BNC
Branch if Not Carry
Syntax:
BNC
n
Operands:
-128
≤ n ≤ 127
Operation:
if CARRY bit is ‘0’
(PC) + 2 + 2n
→ PC
Status Affected:
None
Encoding:
1110
0011
nnnn
nnnn
Description:
If the CARRY 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.
Words:
1
Cycles:
1(2)
Q Cycle Activity:
If Jump:
Q1
Q2
Q3
Q4
Decode
Read literal
‘n’
Process
Data
Write to PC
No
operation
No
operation
No
operation
No
operation
If No Jump:
Q1
Q2
Q3
Q4
Decode
Read literal
‘n’
Process
Data
No
operation
Example:
HERE
BNC
Jump
Before Instruction
PC
=
address (HERE)
After Instruction
If CARRY
=
0;
PC
=
address (Jump)
If CARRY
=
1;
PC
=
address (HERE + 2)
BNN
Branch if Not Negative
Syntax:
BNN
n
Operands:
-128
≤ n ≤ 127
Operation:
if NEGATIVE bit is ‘0’
(PC) + 2 + 2n
→ PC
Status Affected:
None
Encoding:
1110
0111
nnnn
nnnn
Description:
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.
Words:
1
Cycles:
1(2)
Q Cycle Activity:
If Jump:
Q1
Q2
Q3
Q4
Decode
Read literal
‘n’
Process
Data
Write to PC
No
operation
No
operation
No
operation
No
operation
If No Jump:
Q1
Q2
Q3
Q4
Decode
Read literal
‘n’
Process
Data
No
operation
Example:
HERE
BNN
Jump
Before Instruction
PC
=
address (HERE)
After Instruction
If NEGATIVE
=
0;
PC
=
address (Jump)
If NEGATIVE
=
1;
PC
=
address (HERE + 2)



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