Rabbit 2000 Reference Manual

Also see for 2000: Getting started manual User manual Getting started Getting started manual Designers handbook

Rabbit 2000 Reference Manual Manual pdf 23 page image

Instruction Reference Manual 19DescriptionThis is an instruction prefix. Causes the instruction immediately following to affect the alternate flags, or usethe alternate registers for the destination of the data, or both. For some instructions ALTD causes specialalternate register uses, unique to that instruction. This instruction is implemented for the Rabbit and is notavailable for the Z180ExampleThe instructionALTD ADD HL,DEwould add the data in word register DE to the data in word register HL and store the result in the alternateword register HL'.The instructionsALTD LD DE,BCandLD DE',BCboth load the data in word register BC into the alternate word register DE'.ALTDOpcode Instruction Clocks Operation76 ALTD 2 [Sets alternate registerdestination for followinginstruction.]Flags ALTD I/OS Z L/V C F R SP S D- - - -