-CS08/-C08/-CRS08: Derivative family

Group

Code Generation

Scope

Application

Syntax

  -C08|-CS08|-CRS08

Arguments

None

Default

  -C08

Description

The Assembler supports three different HC08-derived cores. The HC08 itself ( -C08), the enhanced HCS08 (-CS08), and the RS08 ( -CRS08).

The HCS08 family supports additional addressing modes for the CPHX, LDHX, and STHX instructions and also a new BGND instruction. All these enhancements are allowed when the -CS08 option is specified. All instructions and addressing modes available for the HC08 are also available for the HCS08 so that this core remains binary compatible with its predecessor.

The RS08 family does not support all instructions and addressing modes of the HC08. Also, the encoding of the supported instructions is not binary compatible.

Table 1. Table of new instructions or addressing modes for the HCS08
Instruction	Addr. mode	Description
LDHX	EXT IX IX1 IX2 SP1	load from a 16-bit absolute address load HX via 0,X load HX via 1,X...255,X load HX via old HX+ any offset load HX from stack
STHX	EXT SP1	store HX to a 16-bit absolute address store HX to stack
CPHX	EXT SP1	compare HX with a 16-bit address compare HX with the stack
BGND		enter the Background Debug Mode