F90_DECO

Decodes the contents of 16-bit data specified by s according to the contents of n if the trigger EN is in the ON-state. The decoded result is stored in the area starting with the 16-bit area specified by d.

Parameters

Input

s (WORD, INT, UINT)

source 16-bit area or equivalent constant to be decoded

n (WORD, INT, UINT)

control data to specify the starting bit position and number of bits to be decoded

Output

d (WORD, INT, UINT)

starting 16-bit area for storing decoded data (destination)

Remarks

• Instead of using this F instruction, we recommend using the corresponding FP7 instruction: FP_DECODEFP_DECODE

• n specifies the starting bit position and the number of bits to be decoded using hexadecimal data:

  • Bit No. 0 to 3: number of bits to be decoded

  • Bit No. 8 to 11: starting bit position to be decoded

  • (The bits No. 4 through No. 7 and No. 12 through No. 15 are invalid.)

    e.g. when n = 16#0404, four bits beginning at bit position four are decoded.

• Relationship between number of bits and occupied data area for decoded result:

  Number of bits to be decoded	Data area required for the result	Valid bits in the area for the result
  1	1-word	2-bit*
  2	1-word	4-bit*
  3	1-word	8-bit*
  4	1-word	16-bit
  5	2-word	32-bit
  6	4-word	64-bit
  7	8-word	128-bit
  8	16-word	256-bit

  *Invalid bits in the data area required for the result are set to 0.

• The variables s, n and d have to be of the same data type.