Freescale-semiconductor StarCore SC140 Instrukcja Użytkownika Pobierz pdf (Strona 85)

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101

Address Generation Unit

SC140 DSP Core Reference Manual 2-53

Integer moves from memory (byte, word, long, two long) are right-aligned in the destination register, and

by default are sign-extended to the left. Unsigned moves are marked with “U” (for example, MOVEU.B),

and zero extended in the destination register. A schematic representation of integer moves from memory

into a 40-bit register is shown in Figure 2-16. Moves from registers to memory use the appropriate portion

from the source register. Moves to registers of less than 40 bits behave the same as in Figure 2-16 up to

their bit length.

Figure 2-16. Integer Move Instructions

Fractional moves are supported only to DALU registers. Moves from memory are put in the high portion

of the data register, sign-extended to the extension, and zero-filled in the low portion. MOVE.L and

MOVE.2L may also be considered fractional moves since alignment in the destination register is the same

for integer long moves and fractional long moves. A schematic representation of fractional moves from

memory to 40-bit data registers is shown in Figure 2-17.

039 8

MOVE.B (signed byte move)

sign extension

039 8

MOVEU.B (unsigned byte move)

zero extension

039 16

MOVE.W (signed word move)

sign extension

039

MOVE.L (signed long move)

sign

extension

039

MOVEU.L (unsigned long move)

zero

extension

MOVE.2L (signed two long move)

039 16

MOVE.2W (signed two word move)

sign extension

039

sign

extension

sign

extension

039

sign extension

MOVE.4W (signed four-word move)

039 16

MOVEU.W (unsigned word move)

zero extension

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