[Instruction] Contents

Advanced Function InstructionFUN 29 D PEXTSIGN EXTENSIONFUN 29 D PEXTD : Register to be taken sign extensionD may combine with V, Z, P0~P9 to serve indirect addressapplicationOperandRangeWY WM WS TMR CTR HR OR SR ROR DR XRWY0∣WY240WM0∣WM1896WS0∣WS984T0∣T255C0∣C255R0∣R3839R3904∣R3967R3968∣R4167R5000∣R8071D0∣D4095P0~P9D ○ ○ ○ ○ ○ ○ ○ ○* ○* ○ ○V、Z• When operation control "EN" = 1 or "EN↑" ( P instruction) from 0 to 1, this instruction will sign extent the 16bit numerical value specified by D to 32-bit value and store it into the 32-bit register comprised by the twosuccessive words, D + 1 and D. (Both values are the same, only it was originally formated as a 16 bitnumerical value, and was then extended to be formated as a 32 bit numerical value.)• This instruction extent the numerical value of a 16-bit register into an equivalent numerical value in a 32-bitregister (for example 33FFH converts to 000033FFH), Its main function is for numerical operations(+,-,*,/,CMP......) which can take the 16 bit or 32 bit numerical values as operand. Before operation all theoperand should be adjusted to the same length for proper operation.X0EN29PEXTR 0• The instruction at left takes a 16 bit numerical value R0,and extends it to an equivalent value in 32 bits, thenstores it into a 32 bit register (DR0=R1R0) comprised R0and R1DR1 R0R1 B15 R0 B0Ignore the value of R1 before1 1 0 0 1 1 1 1 1 1 0 0 0 1 1 1 -12345extension X0=B31 R1 B16 B15 R 0 B0D R1 R0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 1 1 1 1 1 1 0 0 0 1 1 1 -12345Fill B15 value into B31-B16,(if B15 is 0, then B31-B16 are all 0)Before extension(16 bits) R0= CFC7H=−12345After extension(32 bits)R1R0=FFFFCFC7H=−12345The two numerical values are actually the same7-8