STM8S103F2 datasheet(12/121 Pages) STMICROELECTRONICS

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Product overview

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DocID15441 Rev 14

Product overview

The following section provides an overview of the basic features of the device functional

modules and peripherals.

For more detailed information please refer to the corresponding family reference manual

(RM0016).

4.1

Central processing unit STM8

The 8-bit STM8 core is designed for code efficiency and performance.

It contains 6 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 for 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 K-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 look-up 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.

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