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STM8AL3136 Datasheet(PDF) 15 Page - STMicroelectronics |
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STM8AL3136 Datasheet(HTML) 15 Page - STMicroelectronics |
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15 / 124 page  DocID18474 Rev 7 15/124 STM8AL313x/4x/6x STM8AL3L4x/6x Functional overview 54 3.2 Central processing unit STM8 3.2.1 Advanced STM8 core The 8-bit STM8 core is designed for code efficiency and performance with an Harvard architecture and a 3-stage pipeline. It contains six internal registers which are directly addressable in each execution context, 20 addressing modes including indexed indirect and relative addressing, and 80 instructions. Architecture and registers • Harvard architecture • 3-stage pipeline • 32-bit wide program memory bus - single cycle fetching most instructions • X and Y 16-bit index registers - enabling indexed addressing modes with or without offset and read-modify-write type data manipulations • 8-bit accumulator • 24-bit program counter - 16 Mbyte linear memory space • 16-bit stack pointer - access to a 64 Kbyte level stack • 8-bit condition code register - 7 condition flags for the result of the last instruction Addressing • 20 addressing modes • Indexed indirect addressing mode for lookup tables located anywhere in the address space • Stack pointer relative addressing mode for local variables and parameter passing Instruction set • 80 instructions with 2-byte average instruction size • Standard data movement and logic/arithmetic functions • 8-bit by 8-bit multiplication • 16-bit by 8-bit and 16-bit by 16-bit division • Bit manipulation • Data transfer between stack and accumulator (push/pop) with direct stack access • Data transfer using the X and Y registers or direct memory-to-memory transfers 3.2.2 Interrupt controller The medium-density STM8AL313x/4x/6x and STM8AL3L4x/6x feature a nested vectored interrupt controller: • Nested interrupts with 3 software priority levels • 32 interrupt vectors with hardware priority • Up to 40 external interrupt sources on 11 vectors • Trap and reset interrupts |
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