Zilog Z08470 User Manual
Page 162
Z80 Instruction Set
UM008007-0715
150
Z80 CPU
User Manual
r identifies registers B, C, D, E, H, L, or A, assembled as follows in the object code field:
Description
The s operand, along with the Carry Flag (C in the F Register) is added to the contents of
the Accumulator, and the result is stored in the Accumulator.
Condition Bits Affected
S is set if result is negative; otherwise, it is reset.
Z is set if result is 0; otherwise, it is reset.
H is set if carry from bit 3; otherwise, it is reset.
P/V is set if overflow; otherwise, it is reset.
N is reset.
C is set if carry from bit 7: otherwise, it is reset.
Example
If the Accumulator contents are
16h
, the Carry Flag is set, the HL register pair contains
6666h
, and address
6666h
contains
10h
, then upon the execution of an ADC A, (HL)
instruction, the Accumulator contains
27h
.
Register
r
B
000
C
001
D
010
E
011
H
100
L
101
A
111
Instruction
M Cycle
T States
4 MHz E.T.
ADC A, r
1
4
1.00
ADC A, n
2
7 (4, 3)
1.75
ADC A, (HL)
2
7 (4, 3)
1.75
ADC A, (IX+d)
5
19 (4, 4, 3, 5, 3)
4.75
ADC A, (lY+d)
5
19 (4, 4, 3, 5, 3)
4.75