section 7 - Index of

MOVE Move Data MOVEWhen a 56-bit accumulator (A or B) is specified as a destination operand D, any 24-bitsource data to be moved into that accumulator is automatically extended to 56 bits bysign extending the MS bit of the source operand (bit 23) and appending the source operandwith 24 LS zeros. Similarly, any 48-bit source data to be loaded into a 56-bit accumulatoris automatically sign extended to 56 bits. Note that for 24-bit source operandsboth the automatic sign-extension and zeroing features may be disabled by specifyingthe destination register to be one of the individual 24-bit accumulator registers (A 1 orB1). Similarly, for 48-bit source operands, the automatic sign-extension feature may bedisabled by using the long memory move addressing mode and specifying A 10 or B 10 asthe destination operand.Note that the symbols used in decoding the various opcode fields of an instruction or parallelmove are completely arbitrary. Furthermore, the opcode symbols used in oneinstruction or parallel move are completely Independent of the opcode symbols used ina different instruction or parallel move.-