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MC68HC11EA9VFN2 Datasheet(PDF) 8 Page - Freescale Semiconductor, Inc |
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MC68HC11EA9VFN2 Datasheet(HTML) 8 Page - Freescale Semiconductor, Inc |
8 / 58 page MC68HC11EA9 8 MC68HC11EA9TS/D 3 Central Processing Unit A full description of the CPU and instruction set of M68HC11 MCUs is beyond the scope of this sum- mary. The programming model for the M68HC11 CPU and a brief description of the CPU registers is provided here. For more detailed information refer to the M68HC11 Reference Manual (M68HC11RM/ AD) or the programming reference guide or technical data book for the appropriate device. 3.1 Programming Model Figure 4 shows a graphic representation of the internal registers of the M68HC11 CPU. Figure 4 M68HC11 Programming Model 3.2 CPU Registers M68HC11 CPU registers are an integral part of the CPU and are not addressed as if they were memory locations. The seven registers, discussed briefly in the following paragraphs, are shown in Figure 4. For a complete description of the CPU registers, addressing modes, and instruction set refer to the M68HC11 Reference Manual (M68HC11RM/AD). 3.2.1 Accumulators A, B, and D Accumulators A and B are general-purpose 8-bit registers that hold operands and results of arithmetic calculations or data manipulations. For some instructions, these two accumulators are treated as a sin- gle double-byte (16-bit) accumulator called accumulator D. Most instructions can use accumulators A or B interchangeably, however some exceptions apply. 3.2.2 Index Register X (IX) The IX register provides a 16-bit indexing value that can be added to the 8-bit offset provided in an in- struction to create an effective address. The IX register can also be used as a counter or as a temporary storage register. HC11 PROG MODEL 7 15 15 15 15 15 07 0 0 0 0 0 0 ACCUMULATOR A ACCUMULATOR B DOUBLE ACCUMULATOR D INDEX REGISTER X INDEX REGISTER Y STACK POINTER PROGRAM COUNTER CONDITION CODE REGISTER SXH I N Z VC CCR A:B D IX IY SP PC CARRY OVERFLOW ZERO NEGATIVE I INTERRUPT MASK HALF CARRY (FROM BIT 3) X INTERRUPT MASK STOP DISABLE Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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