Microcontrollers Data Sheet

MC68HC(7)08KH12 — Rev. 1.1 Advance Information
Freescale Semiconductor
51
Advance Information — MC68HC(7)08KH12
Section 6. Central Processor Unit (CPU)
6.1 Contents
6.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
6.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
6.4 CPU Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
6.4.1 Accumulator (A). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
6.4.2 Index Register (H:X) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
6.4.3 Stack Pointer (SP). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
6.4.4 Program Counter (PC) . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
6.4.5 Condition Code Register (CCR) . . . . . . . . . . . . . . . . . . . . .57
6.5 Arithmetic/Logic Unit (ALU) . . . . . . . . . . . . . . . . . . . . . . . . . . .59
6.2 Introduction
This section describes the central processor unit. The M68HC08 CPU is
an enhanced and fully object-code-compatible version of the M68HC05
CPU. The CPU08 Reference Manual (Freescale document number
CPU08RM/AD) contains a description of the CPU instruction set,
addressing modes, and architecture.