TMS320F datasheet(374/389 Pages) TI

374 / 389 page

Glossary

D-14

scratch-pad RAM:

Another name for DARAM block B2 in data space

(32 words).

short-immediate value:

An 8-, 9-, or 13-bit constant given as an operand

of an instruction that is using immediate addressing.

sign bit:

The MSB of a value when it is seen by the CPU to indicate the sign

(negative or positive) of the value.

sign extend:

Fill the unused high order bits of a register with copies of the

sign bit in that register.

sign-extension mode (SXM) bit:

Bit 10 of status register ST1; enables or

disables sign extension in the input shifter. It also differentiates between

logic and arithmetic shifts of the accumulator.

single-access RAM:

See

SARAM.

slave phase:

See

latch phase.

software interrupt:

An interrupt caused by the execution of an INTR, NMI,

or TRAP instruction.

software stack:

A program control feature that allows you to extend the

hardware stack into data memory with the PSHD and POPD instructions.

The stack can be directly stored and recovered from data memory, one

word at time. This feature is useful for deep subroutine nesting or protec-

tion against stack overflow.

ST0 and ST1:

See

status registers ST0 and ST1.

stack:

A block of memory reserved for storing return addresses for subrou-

tines and interrupt service routines. The ’C24x stack is 16 bits wide and

eight levels deep.

status registers ST0 and ST1:

Two 16-bit registers that contain bits for

determining processor modes, addressing pointer values, and indicating

various processor conditions and arithmetic logic results. These regis-

ters can be stored into and loaded from data memory, allowing the status

of the machine to be saved and restored for subroutines.

STRB:

External access active strobe. The ’C24x asserts STRB during ac-

cesses to external program, data, or I/O space.

SXM bit:

See

sign-extension mode bit (SXM).

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