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MLC510B Datasheet(PDF) 5 Page - Megawin Technology Co., Ltd |
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MLC510B Datasheet(HTML) 5 Page - Megawin Technology Co., Ltd |
5 / 31 page MEGAWIN MLC510B Technical Summary 5 Program Counter (PC) The 16-bit program counter register provides the addresses, which step the micro-controller through sequential program instructions. Each time the micro-controller fetches an instruction from program memory, the lower byte of the program counter (PCL) is placed on the low-order 8 bits of the address bus, and the higher byte of the program counter (PCH) is placed on the high-order 8 bits. The counter is incremented each time when an instruction or data is fetched from program memory. Stack Pointer (S) The stack pointer is an 8-bit register, which is used to control the addressing of the variable-length stack. The stack pointer is automatically incremented and decremented under control of the micro-controller to perform stack manipulations by the direction of either the program or interrupts (/NMI or /IRQ). The stack allows simple implementation of nested subroutines, and multiple level interrupts. The stack pointer is initialized by the user’s software. |
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