Motorola 24-Bit Digital Signal Processor, DSP56000 manual $Fffe Bcr

INSTRUCTION DESCRIPTIONS

MOVEP

Move Peripheral Data

MOVEP

A MOVEP instruction which specifies SSH as the source operand or LA, LC, SSH, SSL, or SP as the destination operand cannot be used immediately before a DO instruc- tion.

A MOVEP instruction which specifies SSH as the source operand or LA, LC, SR, SSH, SSL, or SP as the destination operand cannot be used immediately before an ENDDO instruction.

A MOVEP instruction which specifies SSH as the source operand or SR, SSH, SSL, or SP as the destination operand cannot be used immediately before an RTI instruction.

A MOVEP instruction which specifies SSH as the source operand or SSH, SSL, or SP as the destination operand cannot be used immediately before an RTS instruction.

A MOVEP instruction which specifies SP as the destination operand cannot be used immediately before a MOVEC, MOVEM, or MOVEP instruction which specifies SSH or SSL as the source operand.

Example:

:

MOVEP #1113,X:<<$FFFE :initialize Bus Control Register wait states

:

X:$FFFE (BCR)

Before Execution

$FFFF

X:$FFFE (BCR)

After Execution

$1113

Explanation of Example: Prior to execution, the 16-bit, X memory-mapped, I/O bus control register (BCR) contains the value $FFFF. The execution of the MOVEP

#$1113,X:<<$FFFE instruction moves the value $1113 into the 16-bit bus control regis- ter X:$FFFE, resulting in one wait state for all external X, external Y, and external pro- gram memory accesses and three wait states for all external I/O accesses.

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