TSC80251 TEMIC [TEMIC Semiconductors], TSC80251 Datasheet - Page 88

• Manufacturer Part Number: TSC80251
• Manufacturer: TEMIC [TEMIC Semiconductors]

Rev. C – May 7, 1999
ADDC A,<src>
Function:
Add with carry
Description:
Simultaneously adds the specified byte variable, the CY flag and the accumulator contents, leaving the result in the
accumulator. If there is a carry out of bit 7 (CY), the CY flag is set; if there is a carry out of bit 3 (AC), the AC flag
is set. When adding unsigned integers, the CY flag indicates that an overflow occurred.
If there is a carry out of bit 6 but not out of bit 7, or a carry out of bit 7 but not bit 6, the OV flag is set. When adding
signed integers, the OV flag indicates a negative number produced as the sum of two positive operands, or a positive
sum from two negative operands.
Bit 6 and bit 7 in this description refer to the most significant byte of the operand (8, 16 or 32 bit)
Four source operand addressing modes are allowed: register, direct, register–indirect and immediate.
Example :
The accumulator contains 0C3h (11000011B), register 0 contains 0AAh (10101010B) and the CY flag is set. After
executing the instruction ADDC A,R0 the accumulator contains 6Eh (01101110B), the AC flag is clear and the CY
and OV flags are set.
ADDC A,#data
[Encoding]
ADDC A,dir8
[Encoding]
FLAGS :
Hex Code in:
Binary Mode = [Encoding]
Source Mode = [Encoding]
Hex Code in:
Binary Mode = [Encoding]
Source Mode = [Encoding]
3 4
3 5
CY
addr7–addr0
immed. data
AC
OV
Operation:
ADDC
(A)
Operation:
ADDC
(A)
(A) + (CY) + #data
(A) + (CY) + (dir8)
N
TSC80251
Z
5.43