Instructions fun 036 - c subtraction with carry – Toshiba 6F3B0253 User Manual
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6F3B0253
150
T1-16S User’s Manual
7. Instructions
FUN 036
-
C
Subtraction with carry
Expression
Input
−
[ A
-
C B
→
C ]
−
Output
Function
When the input is ON, the data of B and the carry flag (CF = S050) are subtracted from A, and the
result is stored in C. If borrow is occurred in the operation, the carry flag is set to ON. If the result is
greater than 32767 or smaller than -32768, the output is turned ON.
This instruction is used to perform unsigned subtraction or double-length subtraction.
Execution condition
Input
Operation
Output
CF
OFF
No execution
OFF
−
ON
Execution
Normal
No borrow
OFF
Reset
Borrow occurred
OFF
Set
Overflow /
No borrow
ON
Reset
underflow
Borrow occurred
ON
Set
Operand
Name
Device
Register
Constant Index
X
Y
R
S
T.
C. XW YW RW SW T
C
D
I
J
K
A Minuend
√
√
√
√
√
√
√
√
√
√
√
√
B Subtrahend
√
√
√
√
√
√
√
√
√
√
√
√
C Difference
√
√
√
√
√
√
√
√
√
√
Example
When R013 is ON, the data of double-length register RW23
⋅
RW22 is subtracted from the data
of D0201
⋅
D0200, and the result is stored in D0211
⋅
D0210. The RSTC is a instruction to reset
the carry flag before starting the calculation.
If the data of D0201
⋅
D0200 is 12345678 and RW23
⋅
RW22 is 12340000, the result 5678 is
stored in D0211
⋅
D0210.
D0201
⋅
D0200 12345678
-
D0211
⋅
D0210
5678
RW23
⋅
RW22
12340000