TMS320C80GF datasheet(62/171 Pages) TI

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TMS320C80

DIGITAL SIGNAL PROCESSOR

SPRS023B – JULY 1994 – REVISED OCTOBER 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

ALU-operation code (continued)

Table 20. Function Modifier Codes

FUNCTION

MODIFIER BITS

MODIFICATION PERFORMED

Normal operation

cin

%! if maskgen instruction, lmo if not maskgen

%! and cin if maskgen instruction, rmo if not maskgen

A port = 0

A port = 0 and cin

A port = 0 and %! if maskgen, lmbc if not maskgen

A port = 0, %! and cin if maskgen, rmbc if not maskgen

mf bit(s) set by carry out(s). (mc)

mf bit(s) set based on status register MSS field. (me)

Rotate mf by Asize, mf bit(s) set by carry out(s). (mrc)

Rotate mf by Asize, mf bit(s) set based on status register MSS field. (mre)

Clear mf, mf bit(s) set by carry out(s). (mzc)

Clear mf, mf bit(s) set based on status register MSS field. (mze)

No setting of bits in mf register. (mx)

Reserved

Legend:

cin

Carry in from sr(C)

Modified mask generator

lmbc

Leftmost-bit change

rmbc

Rightmost-bit change

lmo

Leftmost one

rmo

Rightmost one

miscellaneous operation code

For data-unit opcode format E, the operation field selects one of the miscellaneous operations codes as shown

in Table 21.

Table 21. Miscellaneous Operation Codes

OPCODE BITS

MNEMONIC

OPERATION

MNEMONIC

OPERATION

nop

No data-unit operation. Status not modified

qwait

Wait until comm Q bit is clear

eint

Global-interrupt enable

dint

Global-interrupt disable

eloop

Global loop enable

dloop

Global loop disable

reserved

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