AVR Instruction Set
SES – Set Signed Flag
Description:
Sets the Signed Flag (S) in SREG (Status Register).
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Operation: |
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(i) |
S ← 1 |
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Syntax: |
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Operands: |
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Program Counter: |
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(i) |
SES |
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None |
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PC ← PC + 1 |
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16-bit Opcode: |
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1001 |
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0100 |
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0100 |
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1000 |
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Status Register (SREG) and Boolean Formula: |
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I |
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T |
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H |
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S |
V |
N |
Z |
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C |
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– |
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– |
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– |
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1 |
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– |
– |
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– |
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S:1
Signed Flag set
Example:
add |
r2,r19 |
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Add |
r19 to r2 |
ses |
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Set |
Negative Flag |
Words: 1 (2 bytes)
Cycles: 1
135
0856I–AVR–07/10
SET – Set T Flag
Description:
Sets the T Flag in SREG (Status Register).
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Operation: |
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(i) |
T ← 1 |
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Syntax: |
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Operands: |
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Program Counter: |
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(i) |
SET |
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None |
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PC ← PC + 1 |
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16-bit Opcode: |
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1001 |
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0100 |
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0110 |
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1000 |
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Status Register (SREG) and Boolean Formula: |
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I |
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T |
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H |
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S |
V |
N |
Z |
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C |
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– |
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1 |
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– |
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– |
– |
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– |
– |
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– |
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T:1
T Flag set
Example:
set |
; Set T Flag |
Words: 1 (2 bytes)
Cycles: 1
136 AVR Instruction Set
0856I–AVR–07/10
AVR Instruction Set
SEV – Set Overflow Flag
Description:
Sets the Overflow Flag (V) in SREG (Status Register).
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Operation: |
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(i) |
V ← 1 |
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Syntax: |
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Operands: |
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Program Counter: |
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(i) |
SEV |
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None |
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PC ← PC + 1 |
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16-bit Opcode: |
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1001 |
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0100 |
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0011 |
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1000 |
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Status Register (SREG) and Boolean Formula: |
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I |
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T |
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H |
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S |
V |
N |
Z |
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C |
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– |
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– |
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– |
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– |
1 |
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– |
– |
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– |
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V:1
Overflow Flag set
Example:
add |
r2,r19 |
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Add |
r19 to r2 |
sev |
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Set |
Overflow Flag |
Words: 1 (2 bytes)
Cycles: 1
137
0856I–AVR–07/10
SEZ – Set Zero Flag
Description:
Sets the Zero Flag (Z) in SREG (Status Register).
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Operation: |
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(i) |
Z ← 1 |
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Syntax: |
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Operands: |
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Program Counter: |
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(i) |
SEZ |
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None |
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PC ← PC + 1 |
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16-bit Opcode: |
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1001 |
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0100 |
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0001 |
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1000 |
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Status Register (SREG) and Boolean Formula: |
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I |
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T |
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H |
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S |
V |
N |
Z |
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C |
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Z:1
Zero Flag set
Example:
add |
r2,r19 |
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Add |
r19 to r2 |
sez |
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Set |
Zero Flag |
Words: 1 (2 bytes)
Cycles: 1
138 AVR Instruction Set
0856I–AVR–07/10