AT80251G2D-3CSUM(2006) View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT80251G2D-3CSUM
(Rev.:2006)
(Rev.:2006)
Atmel Corporation
AT80251G2D-3CSUM Datasheet PDF : 77 Pages
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Add 3 if it addresses a Peripheral SFR.
5. If this instruction addresses an I/O Port (Px, x = 0-3), add 3 to the number of states.
Add 5 if it addresses a Peripheral SFR.
6. In internal execution only, add 1 to the number of states of the ‘jump taken’ if the des-
tination address is internal and odd.
Table 31. Summary of Unconditional Jump Instructions
Absolute jumpAJMP <src>(PC) ← (PC) +2; (PC)10:0 ← src opnd
Extended jumpEJMP <src>(PC) ← (PC) + size (instr); (PC)23:0 ← src opnd
Long jumpLJMP <src>(PC) ← (PC) + size (instr); (PC)15:0 ← src opnd
Short jumpSJMP rel(PC) ← (PC) +2; (PC) ← (PC) +rel
Jump indirectJMP at A +DPTR(PC)23:16 ← FFh; (PC)15:0 ← (A) + (DPTR)
No operationNOP(PC) ← (PC) +1
Mnemonic
AJMP
EJMP
<dest>,
<src>(1)
addr11
addr24
at DRk
Comments
Absolute jump
Extended jump
Extended jump (indirect)
Binary Mode
Bytes
2
5
3
States
3(2)(3)
6(2)(4)
7(2)(4)
Source Mode
Bytes
2
4
2
States
3(2)(3)
5(2)(4)
6(2)(4)
LJMP
SJMP
JMP
at WRj
Long jump (indirect)
3
6(2)(4)
2
5(2)(4)
addr16
Long jump (direct address)
3
5(2)(4)
3
5(2)(4)
rel
Short jump (relative address)
2
4(2)(4)
2
4(2)(4)
at A +DPTR Jump indirect relative to the DPTR
1
5(2)(4)
1
5(2)(4)
NOP
No operation (Jump never)
1
1
1
1
Notes:
1. A shaded cell denotes an instruction in the C51 Architecture.
2. In internal execution only, add 1 to the number of states if the destination address is
internal and odd.
3. Add 2 to the number of states if the destination address is external.
4. Add 3 to the number of states if the destination address is external.
38 AT/TSC8x251G2D
4135F–8051–11/06
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