TSC80251G2D
Table 30. Summary of Exchange, Push and Pop Instructions
Exchange bytes
Exchange Digit
Push
XCH A, <src>
XCHD A, <src>
PUSH <src>
(A) ↔ src opnd
(A) ↔ src opnd
(SP) ← (SP) +1; ((SP)) ← src opnd;
(SP) ← (SP) + size (src opnd) - 1
(SP) ← (SP) - size (dest opnd) + 1;
dest opnd ← ((SP)); (SP) ← (SP) -1
3:0
3:0
Pop
POP <dest>
Binary Mode
Source Mode
Mnemonic
<dest>, <src>(1)
Comments
Bytes States Bytes States
A, Rn
A, dir8
A, @Ri
A, @Ri
dir8
ACC and register
1
2
1
1
2
4
5
3
3
3
2
3
3
3
3
2
2
2
2
2
3
4
2
2
2
2
2
2
2
4
(3)
(3)
XCH
ACC and direct address (on-chip RAM or SFR)
ACC and indirect address
3
3
4
5
XCHD
ACC low nibble and indirect address (256 bytes)
Push direct address onto stack
4
5
(2)
(2)
2
2
#data
#data16
Rm
Push immediate data onto stack
4
5
4
5
3
5
3
4
Push 16-bit immediate data onto stack
Push byte register onto stack
PUSH
WRj
Push word register onto stack
DRk
Push double word register onto stack
Pop direct address (on-chip RAM or SFR) from stack
Pop byte register from stack
9
8
(2)
(2)
dir8
3
3
Rm
3
5
9
2
4
8
POP
WRj
Pop word register from stack
DRk
Pop double word register from stack
Notes:
1. A shaded cell denotes an instruction in the C51 Architecture.
2. If this instruction addresses an I/O Port (Px, x= 0-3), add 1 to the number of states. Add 2 if it addresses a Peripheral SFR.
3. If this instruction addresses an I/O Port (Px, x= 0-3), add 2 to the number of states. Add 3 if it addresses a Peripheral SFR.
Table 31. Summary of Conditional Jump Instructions (1/2)
Jump conditional on status
Jcc rel
(PC) ← (PC) + size (instr);
IF [cc] THEN (PC) ← (PC) + rel
Binary Mode
Source Mode
Mnemonic
<dest>, <src>(1)
Comments
Bytes States Bytes States
(3)
(3)
(3)
(3)
(3)
(3)
(3)
(3)
(3)
(3)
(3)
(3)
(3)
(3)
(3)
(3)
(3)
(3)
(3)
(3)
JC
rel
rel
rel
rel
rel
rel
rel
rel
rel
rel
Jump if carry
2
2
3
3
3
3
3
3
3
3
1/4
1/4
2/5
2/5
2/5
2/5
2/5
2/5
2/5
2/5
2
2
2
2
2
2
2
2
2
2
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
JNC
JE
Jump if not carry
Jump if equal
JNE
JG
Jump if not equal
Jump if greater than
JLE
Jump if less than, or equal
JSL
Jump if less than (signed)
JSLE
JSG
JSGE
Notes:
Jump if less than, or equal (signed)
Jump if greater than (signed)
Jump if greater than or equal (signed)
1. A shaded cell denotes an instruction in the C51 Architecture.
2. States are given as jump not-taken/taken.
3. In internal execution only, add 1 to the number of states of the ‘jump taken’ if the destination address is internal and odd.
25
Rev. A - May 7, 1999
TEMIC [ TEMIC SEMICONDUCTORS ]
