5.2.3 .pfillvalue [value]

Define the byte value to be used as fill in a code section when memory (bits 0-23) is skipped due to an alignment or data defining p directive. If value is not specified, it is reset to its default 0x000000. Directives that may cause a program word to be filled are: .palign, .pfill, .pskip, .porg, and .pspace. The value is persistent for a given code section, throughout the entire source file, and may be changed to another value by issuing subsequent .pfillvalue directives.

See the Section Example table.