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Chapter 10
Central processor unit
10.1 Introduction
This section provides summary information about the registers, addressing modes, special
operations, instructions and exceptions processing of the HCS08 V6 CPU.
The HCS08 V6 CPU is fully source- and object-code-compatible with the HCS08 CPU.
10.1.1 Features
Features of the HCS08 V6 CPU include:
• Object code fully upward-compatible with M68HC05 and M68HC08 families
• 16-bit stack pointer (any size stack anywhere in 64 KB CPU address space)
• 16-bit index register (H:X) with powerful indexed addressing modes
• 8-bit accumulator (A)
• Many instructions treat X as a second general-purpose 8-bit register
• Seven addressing modes:
• Inherent — Operands in internal registers
• Relative — 8-bit signed offset to branch destination
• Immediate — Operand in next object code byte(s)
• Direct — Operand in memory at 0x0000–0x00FF
• Extended — Operand anywhere in 64-Kbyte address space
NXP Semiconductors
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
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