HCS12 datasheet(93/452 Pages) FREESCALE

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S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

oprx0_xysp — This word breaks down into one of the following

alternative forms that assemble to an 8-bit indexed

addressing postbyte code. These forms generate the

same object code except for the value of the postbyte

code, which is designated as xb in the object code

columns of the glossary pages. As with the source

forms, treat all commas, plus signs, and minus signs as

literal syntax elements. The italicized words used in

these forms are included in this key.

oprx5,xysp

oprx3,–xys

oprx3,

+xys

oprx3,xys–

oprx3,xys

abd,xysp

oprx3 — Any label or expression that evaluates to a value in the

range

+1to +8

oprx5 — Any label or expression that evaluates to a 5-bit value in

the range –16 to

+15

oprx9 — Any label or expression that evaluates to a 9-bit value in

the range –256 to

+255

oprx16 — Any label or expression that evaluates to a 16-bit value.

Since the CPU12 has a 16-bit address bus, this can be

either a signed or an unsigned value.

page — Any label or expression that evaluates to an 8-bit value.

The CPU12 recognizes up to an 8-bit page value for

memory expansion but not all MCUs that include the

CPU12 implement all of these bits. It is the

programmer’s responsibility to limit the page value to

legal values for the intended MCU system. Some

assemblers require a # symbol before this value.

rel8 — Any label or expression that refers to an address that is

within –128 to

+127 locations from the next address after

the last byte of object code for the current instruction.

The assembler will calculate the 8-bit signed offset and

include it in the object code for this instruction.

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