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Subtract From Accumulator With Shift Specified by TREG
SUBT
7-185
Assembly Language Instructions
Cycles for a Single SUBT Instruction
Program
Operand ROM DARAM SARAM External
DARAM 1 1 1 1+p
SARAM 1 1 1, 2
†
1+p
External 1+d 1+d 1+d 2+d+p
†
If the operand and the code are in the same SARAM block.
Cycles for a Repeat (RPT) Execution of an SUBT Instruction
Program
Operand
ROM
DARAM SARAM External
DARAM n n n n+p
SARAM n n n, n+1
†
n+p
External n+nd n+nd n+nd n+1+p+nd
†
If the operand and the code are in the same SARAM block.
Example 1 SUBT DAT127 ;(DP = 5: addresses 0280h–02FFh)
Before Instruction After Instruction
Data Memory Data Memory
2FFh 06h 2FFh 06h
TREG 08h TREG 08h
ACC X 0FDA5h ACC 1 0F7A5h
CC
Example 2 SUBT *
Before Instruction After Instruction
ARP 1 ARP 1
AR1 800h AR1 800h
Data Memory Data Memory
800h 01h 800h 01h
TREG 08h TREG 08h
ACC X 0h ACC 0 FFFFFF00h
CC
Cycles