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MC908QT2A Datasheet(PDF) 66 Page - Freescale Semiconductor, Inc |
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MC908QT2A Datasheet(HTML) 66 Page - Freescale Semiconductor, Inc |
66 / 200 page Central Processor Unit (CPU) MC68HC908QYA/QTA Family Data Sheet, Rev. 2 66 Freescale Semiconductor Figure 7-1. CPU Registers 7.3.1 Accumulator The accumulator is a general-purpose 8-bit register. The CPU uses the accumulator to hold operands and the results of arithmetic/logic operations. 7.3.2 Index Register The 16-bit index register allows indexed addressing of a 64-Kbyte memory space. H is the upper byte of the index register, and X is the lower byte. H:X is the concatenated 16-bit index register. In the indexed addressing modes, the CPU uses the contents of the index register to determine the conditional address of the operand. The index register can serve also as a temporary data storage location. Bit 7 654321 Bit 0 Read: Write: Reset: Unaffected by reset Figure 7-2. Accumulator (A) Bit 15 14 13 12 11 10 987654321 Bit 0 Read: Write: Reset: 00000000 XXXXXXXX X = Indeterminate Figure 7-3. Index Register (H:X) ACCUMULATOR (A) INDEX REGISTER (H:X) STACK POINTER (SP) PROGRAM COUNTER (PC) CONDITION CODE REGISTER (CCR) CARRY/BORROW FLAG ZERO FLAG NEGATIVE FLAG INTERRUPT MASK HALF-CARRY FLAG TWO’S COMPLEMENT OVERFLOW FLAG V1 1 H I N Z C H X 0 0 0 0 7 15 15 15 70 |
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