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+(P),-(P)
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6.2 Arithmetic Operation Instructions
6.2.1 BIN 16-bit addition and subtraction operations (+(P),-(P))
–
(1) Subtracts 16-bit BIN data designated by from 16-bit BIN data designated by and
stores the result of the subtraction at the device designated by .
(2) Values for and can be designated between 32768 and 32767 (BIN, 16 bits).
(3) The judgment of whether data is positive or negative is made by the most significant bit
(b15).
• 0: Positive
• 1: Negative
(4) The following will happen when an underflow or overflow is generated in an operation result:
The carry flag in this case does not go ON.
Operation Error
(1) There are no operation errors associated with the +(P) or -(P) instruction.
D
S
D
b0
5678 (BIN)
b15
b0
4444 (BIN)
b15b0
1234 (BIN)
b15
D S D
S
D
Since bit 15 value is "0",
result of operation takes a positive value.
Since bit 15 value is "1",
result of operation takes a negative value.
K32767
K2
(7FFF
H)
K 32767
K
2
K32766
(7FFE
H)
(8001
H)(FFFEH)
(8000
H) (0002H)
K
32768