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8/7/2019 CCE404 Chapter 6-0
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3/24/2008 prepared by :Maher A l-omari١
8085 instructions
Chapter 6
8/7/2019 CCE404 Chapter 6-0
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Data transfer instructions
sec 6.1 was covered in chapter 2
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Addressing modes
Immediate addressing : MVI C,32
Register addressing : MOV H,B.
direct addressing : STA 2065. Indirect addressing : MOV M,B.
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Arithmetic Operations
Section 6.2 from text
They perform arithmetic operations on data
in registers and memory.
They affect the flags (Register F)
CYPACZS
D0
D1
D2
D3
D4
D5
D6
D7
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ADD r (Add register).
Section 6.2 from text
(A)(A) ← (A) + (r)(A) + (r)
CY=P=AC=Z =S =(A) = 7D 0 0 0 1 0
[All flags are affected][All flags are affected]
R is
A,B,C,D,E,H,L
ADD C
+ 5AH5AH
C23H23H
A7DH7DH
A
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ADD M (Add memory contents).
Section 6.2 from text
(A)(A) ← (A) + (M)(A) + (M)
CY=P=AC=Z =S =(A) = 48 0 0 0 1 0
[All flags are affected][All flags are affected]
M is contents of
memory location
pointed at by H,L
ADD M
+ 36H36H
M12H12H
A48H48H
A
CAH2060
36H2061
2061H2061H
HL
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ADI , data (Add immediate).
Section 6.2 from text
(A)(A) ← (A) + data(A) + data
CY=P=AC=Z =S =(A) = 00 0 1 1 1 1
[All flags are affected][All flags are affected]
Any 8-bit number
ADI 88
+ 88H88H88H78H78H
A00H00H
A
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Subtractions complement ’ 2
Section 6.2 from text
CY=P=AC=Z =S =(A) = C9 1 0 0 1 1
[All flags are affected][All flags are affected]
-5AH5AHC
23H23H
A23H23H
A
A6HA6H
C’+
C9HC9H11
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SUB r (subtract register).
Section 6.2 from text
(A)(A) ← (A)(A) -- (r)(r)
CY=P=AC=Z =S =(A) = C9 1 0 0 1 1
[All flags are affected][All flags are affected]
R is
A,B,C,D,E,H,L
SUB C
- 5AH5AH
C23H23H
A
C9HC9H
A
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SUB M (subtract memory contents).
Section 6.2 from text
(A)(A) ← (A)(A) -- (M)(M)
CY=P=AC=Z =S =(A) = 48 0 0 0 1 1
[All flags are affected][All flags are affected]
M is contents of
memory location
pointed at by H,L
SUB M
- CAHCAH
M
12H12H
A
48H48H
A
CAH2060
36H2061
2060H2060H
HL
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SUI , data (subtract immediate).
Section 6.2 from text
(A)(A) ← (A)(A) -- datadata
CY=P=AC=Z =S =(A) = F0 1 0 1 1 1
[All flags are affected][All flags are affected]
Any 8-bit number
SUI ,88
- 88H88H88H78H78H
A
F0HF0H
A
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INR R (Increment register).
Section 6.2 from text
(R)(R) ← (R) + 1(R) + 1
CY=P=AC=Z =S =(A) = NC 0 1 1 1 NC
[All flags are affected except[All flags are affected except
the carry flag]the carry flag]
INR E
+ 1H1H1HFFHFFH
E
00H00H
E
R is
A,B,C,D,E,H,L
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INR M (Increment memory).
Section 6.2 from text
(M)(M) ← (M) + 1(M) + 1
CY=P=AC=Z =S =(A) = NC 1 0 1 0 NC
[All flags are affected except[All flags are affected except
the carry flag]the carry flag]
INR M
+ 1H1H1HCFH
M
D0HD0H
M
M is contents of
memory location
pointed at by H,L
CFH2060
36H2061
2060H2060H
HL
D0H
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DCR M (decrement memory).
Section 6.2 from text
(M)(M) ← (M)(M) -- 11
CY=P=AC=Z =S =(A) = NC 1 0 1 1 NC
[All flags are affected except[All flags are affected except
the carry flag]the carry flag]
DCR M
- 1H1H1HCFH
M
CEHCEH
M
M is contents of
memory location
pointed at by H,L
CFH2060
36H2061
2060H2060H
HL
CEH
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INX Rp (Increment register pair).
Section 6.2 from text
((RpRp)) ← ((RpRp) + 1) + 1
CY=P=AC=Z =S =
[All flags are NOT affected[All flags are NOT affected
INX H
+ 1H1H1H20FF
HL
21002100
HL
Rp is contents of
regiter pair
H,B,D,SP
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DCX Rp (Decrement register pair).
Section 6.2 from text
((RpRp)) ← ((RpRp)) -- 11
CY=P=AC=Z =S =
[All flags are NOT affected[All flags are NOT affected
DCX sp
- 1H1H1H2000
SP
1FFF1FFF
SP
Rp is contents of
regiter pair
H,B,D,SP
