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CHAPTER 6 DETAILED RULES FOR EXECUTION INSTRUCTIONS
6.73 SUBCW (SUBtract Word Data of Accumulator from
Temporary Accumulator with Carry to Accumulator)
Subtract the word data of A from that of T, subtract a carry and then return the result to
A.
■ SUBCW (SUBtract Word Data of Accumulator from Temporary Accumulator with
Carry to Accumulator)
Operation
(AL) ← (T) - (A) - C (Word subtraction with carry)
Assembler format
SUBCW A
Condition code (CCR)
+: Changed by executing instruction
-: Not changed
N: Set to 1 if the MSB of A is 1 as the result of operation and set to 0 in other cases.
Z: Set to 1 if the result of operation is 0000
H
and set to 0 in other cases.
V: Set to 1 if an overflow occurs as the result of operation and set to 0 in other cases.
C: Set to 1 if a carry occurs as the result of operation and set to 0 in other cases.
Number of execution cycle: 1
Byte count: 1
OP code: 33
NZVC
++++