A-123
INSTRUCTION SET REFERENCE
SRL WRj
Binary Mode Source Mode
Bytes: 32
States: 21
Hex Code in: Binary Mode = [A5][Encoding]
Source Mode = [Encoding]
Operation: SRL
(WRj).15 ← 0
(WRj).b ← (WRj).b+1
CY← (WRj).0
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.
Flags:
†For word and dword subtractions, AC is not affected.
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.
Variations
SUB Rmd,Rms
Binary Mode Source Mode
Bytes: 32
States: 21
[Encoding] 0 0 0 1 1 1 1 0 t t t t 0 1 0 0
CY AC OV N Z
✓✓†✓✓✓
[Encoding] 1 0 0 1 1 1 0 0 s s s s S S S S
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