TSC80251 TEMIC [TEMIC Semiconductors], TSC80251 Datasheet - Page 83

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

TSC80251
ADD <dest>,<src>
Function:
Add
Description:
Adds the source operand to the destination operand, which can be a register or the accumulator, leaving the result in
the register or accumulator. If there is a carry out of bit 7 (CY), the CY flag is set. If byte variables are added, and if
there is a carry out of bit 3 (AC), the AC flag is set. For addition of 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:
Register 1 contains 0C3h (11000011B) and register 0 contains 0AAh (10101010B). After executing the instruction
ADD R1,R0 register 1 contains 6Dh (01101101B), the AC flag is clear, and the CY and OV flags are set.
ADD A,#data
[Encoding]
ADD A,dir8
[Encoding]
5.38
FLAGS :
Hex Code in:
Binary Mode = [Encoding]
Source Mode = [Encoding]
Hex Code in:
Binary Mode = [Encoding]
Source Mode = [Encoding]
If this instruction addresses a Port (Px, x = 0-3), add 1 state.
2 4
2 5
CY
addr7–addr0
immed. data
AC
OV
Operation:
ADD
(A)
Operation:
ADD
(A)
(A) + #data
(A) + (dir8)
N
Rev. C – May 7, 1999
Z