5.6.2.7 .skip size[, fill] 
.space size[, fill]

Reserve size bytes. Each byte is filled with the value fill.

fill is optional. If the value specified for fill is larger than a byte, a warning is displayed and the value is truncated to a byte. If not specified:

  • In a data section, a value of 0x00 is used to fill the skipped bytes.
  • In a code section, the last specified .fillvalue is used to fill the lower two bytes of program memory and the last specified .fillupper is used to fill the upper program memory byte.