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M68HC08 Datasheet(PDF) 79 Page - Freescale Semiconductor, Inc |
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M68HC08 Datasheet(HTML) 79 Page - Freescale Semiconductor, Inc |
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79 / 332 page  Central Processor Unit (CPU) MC68HC908JB16 — Rev. 1.1 Technical Data Freescale Semiconductor Central Processor Unit (CPU) 79 NOTE: The location of the stack is arbitrary and may be relocated anywhere in RAM. Moving the SP out of page 0 ($0000 to $00FF) frees direct address (page 0) space. For correct operation, the stack pointer must point only to RAM locations. 6.4.4 Program Counter The program counter is a 16-bit register that contains the address of the next instruction or operand to be fetched. Normally, the program counter automatically increments to the next sequential memory location every time an instruction or operand is fetched. Jump, branch, and interrupt operations load the program counter with an address other than that of the next sequential location. During reset, the program counter is loaded with the reset vector address located at $FFFE and $FFFF. The vector address is the address of the first instruction to be executed after exiting the reset state. Bit 15 14 13 12 11 10 987654321 Bit 0 Read: Write: Reset: Loaded with Vector from $FFFE and $FFFF Figure 6-5. Program Counter (PC) |
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