Instruction Set
SEN - Set Negative Flag
Description:
Sets the Negative flag (N) in SREG (status register).
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Operation: |
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(i) |
N ← 1 |
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Syntax: |
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Operands: |
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Program Counter: |
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(i) |
SEN |
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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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0010 |
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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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1 |
- |
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- |
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N:1
Negative flag set
Example:
add |
r2,r19 |
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Add |
r19 to r2 |
sen |
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Set |
negative flag |
Words: 1 (2 bytes)
Cycles: 1
113
SER - Set all bits in Register
Description:
Loads $FF directly to register Rd.
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Operation: |
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(i) |
Rd ← $FF |
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Operands: |
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Program Counter: |
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(i) |
SER Rd |
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16 ≤ d ≤ 31 |
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PC ← PC + 1 |
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16-bit Opcode: |
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1110 |
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1111 |
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dddd |
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1111 |
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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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Example: |
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clr |
r16 |
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; Clear r16 |
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ser |
r17 |
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; Set r17 |
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out |
$18,r16 |
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; Write zeros to Port B |
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nop |
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; Delay (do nothing) |
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out |
$18,r17 |
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; Write ones to Port B |
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Words: 1 (2 bytes)
Cycles: 1
114 Instruction Set 
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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1 |
- |
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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
115
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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1 |
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T:1
T flag set
Example:
set |
; Set T flag |
Words: 1 (2 bytes)
Cycles: 1
116 Instruction Set 