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MC68HC705P9CS 数据表(PDF) 47 Page - Freescale Semiconductor, Inc |
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MC68HC705P9CS 数据表(HTML) 47 Page - Freescale Semiconductor, Inc |
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47 / 160 page  Central Processor Unit (CPU) CPU Registers MC68HC705P9 — Rev. 4.0 Technical Data MOTOROLA Central Processor Unit (CPU) 47 4.6.3 Stack Pointer The stack pointer is a 16-bit register that contains the address of the next stack location to be used. During a reset or after the reset stack pointer instruction (RSP), the stack pointer is preset to $00FF. The address in the stack pointer decrements after a byte is stacked and increments before a byte is unstacked. The 10 most significant bits of the stack pointer are permanently fixed at 0000000011, so the stack pointer produces addresses from $00C0 to $00FF. If subroutines and interrupts use more than 64 stack locations, the stack pointer wraps around to address $00FF and begins writing over the previously stored data. A subroutine uses two stack locations; an interrupt uses five locations. Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Bit 0 Read: 0 0 0 0 0 0 0 0 1 1 Write: Reset: 0 000 00 00 111 11 111 = Unimplemented Figure 4-4. Stack Pointer (SP) Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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