TSC80251 TEMIC [TEMIC Semiconductors], TSC80251 Datasheet - Page 201

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

5.156
TSC80251
SUB <dest>,<src>
Function:
Subtract
Description:
Subtracts the specified variable from the destination operand, leaving the result in the destination operand. SUB sets
the CY (borrow) flag if a borrow is needed for bit 7. Otherwise, CY is clear.
When subtracting signed integers, the OV flag indicates a negative number produced when a negative value is
subtracted from a positive value, or a positive result when a positive number is subtracted from a negative number.
Bit 7 in this description refers to the most significant byte of the operand (8, 16, or 32 bit)
The source operand allows four addressing modes: immediate, indirect, register and direct.
Example :
Register 1 contains 0C9h (11001001B) and register 0 contains 54h (01010100B). After executing the instruction SUB
R1,R0 register 1 contains 75h (01110101B), the CY and AC flags are clear, and the OV flag is set.
SUB Rmd,Rms
[Encoding]
SUB WRjd,WRjs
[Encoding]
FLAGS :
Hex Code in:
Binary Mode =[A5][Encoding]
Source Mode = [Encoding]
Hex Code in:
Binary Mode =[A5][Encoding]
Source Mode = [Encoding]
For word and dword subtractions, AC is not affected.
1001
1001
CY
1100
1101
AC
ssss
tttt
OV
TTTT
SSSS
Operation:
SUB
(Rmd)
Operation:
SUB
(WRjd)
(Rmd) - (Rms)
(WRjd) - (WRjs)
N
Rev. C – May 7, 1999
Z