TMS320F datasheet(274/389 Pages) TI

274 / 389 page

SUB

Subtract From Accumulator

7-174

Execution

Increment PC, then ...

Event

Addressing mode

(ACC) – ((data-memory address)

2shift ) → ACC

Direct or indirect

(ACC) – ( (data-memory address)

216 ) → ACC

Direct or indirect

(shift of 16)

(ACC) – k

→ ACC

Short immediate

(ACC) – lk

2shift → ACC

Long immediate

Status Bits

Affected by

Affects

Addressing mode

OVM and SXM

OV and C

Direct or indirect

OVM

OV and C

Short immediate

OVM and SXM

OV and C

Long immediate

Description

In direct, indirect, and long immediate addressing, the content of the ad-

dressed data-memory location or a 16-bit constant are left shifted and sub-

tracted from the accumulator. During shifting, low-order bits are zero filled.

High-order bits are sign extended if SXM = 1 and zero filled if SXM = 0. The

result is then stored in the accumulator.

If short immediate addressing is used, an 8-bit positive constant is subtracted

from the accumulator. In this case, no shift value may be specified, the subtrac-

tion is unaffected by SXM, and the instruction is not repeatable.

Normally, the carry bit is cleared (C = 0) if the result of the subtraction gener-

ates a borrow; it is set (C = 1) if it does not generate a borrow. However, if a

16-bit shift is specified with the subtraction, the instruction will clear the carry

bit if a borrow is generated but will not affect the carry bit otherwise.

Words

Addressing mode

Direct, indirect

or short immediate

Long immediate

TMS320F Datasheet(PDF) 274 Page - Texas Instruments

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