22.11.2.2 Compare Memory

• Summary

Compares two blocks of data at the specified positions (offset), and writes the comparison result to the storage address.
The following values are stored as the comparison result: When the values are equal: When the target data is larger than the original data: When the target data is smaller than the original data: When an error occurs, the error status value is written to LS9152.

• Format

_memcmp ([Compared block Address], [Compare To Block Address], [Comparison Result Storage Address], Offset from Start of Block, Number of Compared Words, Words in 1 Block)

• Parameter 1: Internal Device

• Parameter 2: Internal Device

• Parameter 3: Internal Device

• Parameter 4: Numeric Value (0 to 639), Internal Device, Temporary variable

• Parameter 5: Numeric Value (1 to 640)

• Parameter 6: Numeric Value (1 to 640)

• Stored Data
  0: Compare
  1: Compare < Compare to
  2: Compare > Compare to

Example expression 1:

_memcmp ([w:[#INTERNAL]LS1000], [w:[#INTERNAL]LS1005], [w:[#INTERNAL]LS0100], 0, 1, 5)

• Compare one word from Block 1 and Block 2 (starting from offset 0) and save the comparison result in LS0100

Since the source value is smaller than the target value, the comparison result "1" is stored in LS0100.

Example expression 2:

_memcmp ([w:[#INTERNAL]LS1000], [w:[#INTERNAL]LS1010], [w:[#INTERNAL]LS0100], 2, 3, 5)

• Compare one word from Block 1 and Block 3 (starting from offset 2) and save the comparison result in LS0100

Since the values of the original and target data match, the comparison result "0" is stored in LS0100.

• Error Status