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MC9S08QG8MDNE Datasheet(PDF) 90 Page - Freescale Semiconductor, Inc |
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MC9S08QG8MDNE Datasheet(HTML) 90 Page - Freescale Semiconductor, Inc |
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90 / 314 page  Chapter 7 Central Processor Unit (S08CPUV2) MC9S08QG8 and MC9S08QG4 Data Sheet, Rev. 5 88 Freescale Semiconductor 7.2 Programmer’s Model and CPU Registers Figure 7-1 shows the five CPU registers. CPU registers are not part of the memory map. Figure 7-1. CPU Registers 7.2.1 Accumulator (A) The A accumulator is a general-purpose 8-bit register. One operand input to the arithmetic logic unit (ALU) is connected to the accumulator and the ALU results are often stored into the A accumulator after arithmetic and logical operations. The accumulator can be loaded from memory using various addressing modes to specify the address where the loaded data comes from, or the contents of A can be stored to memory using various addressing modes to specify the address where data from A will be stored. Reset has no effect on the contents of the A accumulator. 7.2.2 Index Register (H:X) This 16-bit register is actually two separate 8-bit registers (H and X), which often work together as a 16-bit address pointer where H holds the upper byte of an address and X holds the lower byte of the address. All indexed addressing mode instructions use the full 16-bit value in H:X as an index reference pointer; however, for compatibility with the earlier M68HC05 Family, some instructions operate only on the low-order 8-bit half (X). Many instructions treat X as a second general-purpose 8-bit register that can be used to hold 8-bit data values. X can be cleared, incremented, decremented, complemented, negated, shifted, or rotated. Transfer instructions allow data to be transferred from A or transferred to A where arithmetic and logical operations can then be performed. For compatibility with the earlier M68HC05 Family, H is forced to 0x00 during reset. Reset has no effect on the contents of X. SP PC CONDITION CODE REGISTER CARRY ZERO NEGATIVE INTERRUPT MASK HALF-CARRY (FROM BIT 3) TWO’S COMPLEMENT OVERFLOW H X 0 0 0 7 15 15 70 ACCUMULATOR A INDEX REGISTER (LOW) INDEX REGISTER (HIGH) STACK POINTER 87 PROGRAM COUNTER 16-BIT INDEX REGISTER H:X CCR C V1 1 H I N Z |
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