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MC9S08QG8CPBE Datasheet(PDF) 85 Page - Freescale Semiconductor, Inc |
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MC9S08QG8CPBE Datasheet(HTML) 85 Page - Freescale Semiconductor, Inc |
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85 / 300 page  MC9S08QG8 and MC9S08QG4 Data Sheet, Rev. 1.01 Freescale Semiconductor 85 Chapter 7 Central Processor Unit (S08CPUV2) 7.1 Introduction This section provides summary information about the registers, addressing modes, and instruction set of the CPU of the HCS08 Family. For a more detailed discussion, refer to the HCS08 Family Reference Manual, volume 1, Freescale Semiconductor document order number HCS08RMV1/D. The HCS08 CPU is fully source- and object-code-compatible with the M68HC08 CPU. Several instructions and enhanced addressing modes were added to improve C compiler efficiency and to support a new background debug system which replaces the monitor mode of earlier M68HC08 microcontrollers (MCU). 7.1.1 Features Features of the HCS08 CPU include: • Object code fully upward-compatible with M68HC05 and M68HC08 Families • All registers and memory are mapped to a single 64-Kbyte address space • 16-bit stack pointer (any size stack anywhere in 64-Kbyte 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 — Indexed relative to H:X — Five submodes including auto increment — Indexed relative to SP — Improves C efficiency dramatically • Memory-to-memory data move instructions with four address mode combinations • Overflow, half-carry, negative, zero, and carry condition codes support conditional branching on the results of signed, unsigned, and binary-coded decimal (BCD) operations • Efficient bit manipulation instructions • Fast 8-bit by 8-bit multiply and 16-bit by 8-bit divide instructions • STOP and WAIT instructions to invoke low-power operating modes |
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