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HC705RC16GRS/D Datasheet(PDF) 34 Page - NXP Semiconductors |
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HC705RC16GRS/D Datasheet(HTML) 34 Page - NXP Semiconductors |
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34 / 120 page  Central Processor Unit General Release Specification MC68HC705RC16 — Rev. 3.0 Central Processor Unit 3.6 Stack Pointer The stack pointer (SP) contains the address of the next free location on the stack. During an MCU reset or the reset stack pointer (RSP) instruction, the stack pointer is set to location $00FF. The stack pointer is then decremented as data is pushed onto the stack and incremented as data is pulled from the stack. When accessing memory, the seven most significant bits are permanently set to 0000011. These seven bits are appended to the six least significant register bits to produce an address within the range of $00FF to $00C0. Subroutines and interrupts may use up to 64 (decimal) locations. If 64 locations are exceeded, the stack pointer wraps around and loses the previously stored information. A subroutine call occupies two locations on the stack; an interrupt uses five locations. 3.7 Program Counter The program counter (PC) is a 13-bit register that contains the address of the next byte to be fetched. NOTE: The HC05 CPU core is capable of addressing a 64-Kbyte memory map. For this implementation, however, the addressing registers are limited to an 16-Kbyte memory map. 13 7 0 0000011 SP 13 0 PC Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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