Jameco-electronics Rabbit 3000 Manual do Utilizador descarregar pdf (Página 303)

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294 Rabbit 3000 Microprocessor

B.1.9.2 New Block Copy Opcodes

The LDxR family of block move opcodes has been expanded. In the Rabbit 3000 proces-

sor, block copy operations could only be done between memory addresses, or from mem-

ory to an I/O address. In addition, the destination I/O address would increment (or

decrement if using LDDR) after each byte, making the block copy opcodes effectively

useless for repeated reads or writes to a peripheral (for example, a device on the external

I/P bus).

Six new block copy opcodes were added to the Rabbit 3000 revision. These opcodes can

copy from an I/O address as well as to one, and either the source or destination address can

remain fixed instead of changing after each byte. The new opcodes are described in

Table B-19.

Table B-19. Rabbit 3000 Revision Block Copy Opcode Effects

Opcode

Source

Address

Change

Destination

Address

Change

IOI/IOE

Affects

LDDR

- - destination

LDIR

+ + destination

LDDSR

- none destination

LDISR

+ none destination

LSDR

--source

LSIR

++source

LSDDR

none - source

LSIDR

none + source

1 2 ... 298 299 300 301 302 303 304 305 306 307 308 ... 348 349

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