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Square Value and Subtract Previous Product
SQRS
7-171
Assembly Language Instructions
Cycles for a Repeat (RPT) Execution of an SQRS 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 SQRS DAT9 ;(DP = 6: addresses 0300h–037Fh,
;PM = 0: no shift of product)
Before Instruction After Instruction
Data Memory Data Memory
309h 08h 309h 08h
TREG 1124h TREG 08h
PREG 190h PREG 40h
ACC X 1450h ACC 1 12C0h
CC
Example 2 SQRS *,AR5 ;(PM = 0)
Before Instruction After Instruction
ARP 3 ARP 5
AR3 309h AR3 309h
Data Memory Data Memory
309h 08h 309h 08h
TREG 1124h TREG 08h
PREG 190h PREG 40h
ACC X 1450h ACC 1 12C0h
CC