APR2SLASHD datasheet(77/101 Pages) NXP

77 / 101 page

DSP56001A

Substituting the DSP56001A for the DSP56001

MOTOROLA

DSP56001A/D, Rev. 1

4-3

MOVEP IMMEDIATE

MOVEP Immediate instructions take 3 instruction cycles on the DSP56001. On the DSP56001A,

these instructions take only 2 instruction cycles. DSP56001 software that is dependent on the

timing of this form of the MOVEP instruction must be modified when ported to the DSP56001A.

ILLEGAL INSTRUCTIONS

The instructions listed in Table 4-1 will not generate an illegal instruction interrupt on the

DSP56001A. None of these instructions are tested on the DSP56001A and should not be used.

Note:

The DEBUG and DEBUGcc instructions are microcoded on the DSP56001A,

but the peripherals necessary to make use of this instruction are not available.

Any use of the DEBUG or DEBUGcc instructions will completely halt the

processor. The processor will exit this state only on reset.

STOP/WAIT TIMING

Wake-up from the Stop and Wait operating modes with IRQA and IRQB is longer on the

DSP56001A by one Tc period.

SCI/SSI INITIALIZATION TIMING

On the DSP56001A, the SCI and SSI clocks are stopped when the peripherals are not enabled in

order to save power. As a result, the initialization time of the SCI and SSI is longer on the

DSP56001A than on the DSP56001.

Table 4-1

Illegal Instructions

Instruction Symbol

Instruction Name

DEBUG—DO NOT USE

Enter Debug mode

DEBUGcc—DO NOT USE

Enter Debug mode conditionally

DEC

Decrement by one

INC

Increment by one

MAC #iiii

Signed multiply-accumulate immediate

MPY #iiii

Signed multiply immediate

MACR #iiii

Signed multiply-accumulate and round immediate

MPYR #iiii

Signed multiply and round immediate

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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