Calculator User Manual

SUB Subtract From Accumulator
7-176
Cycles for a Single SUB Instruction (Using Direct and Indirect Addressing)
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 SUB Instruction (Using Direct
and Indirect Addressing)
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.
Cycles for a Single SUB Instruction (Using Short Immediate Addressing)
ROM
DARAM SARAM External
1 1 1 1+p
Cycles for a Single SUB Instruction (Using Long Immediate Addressing)
ROM DARAM SARAM External
2 2 2 2+2p
Example 1 SUB DAT80 ;(DP = 8: addresses 0400h–047Fh,
;SXM=0: sign-extension suppressed)
Before Instruction After Instruction
Data Memory Data Memory
450h 11h 450h 11h
ACC X 24h ACC 1 13h
CC
Example 2 SUB *–,1,AR0 ;(Left shift by 1, SXM = 0)
Cycles