STLUX385ATR datasheet(20/126 Pages) STMICROELECTRONICS

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Product overview

STLUX

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DocID027870 Rev 1

5.2

Internal controller (CPU)

The STLUX family integrates a programmable STM8 controller acting as a device

supervisor. The STM8 is a modern CISC core and has been designed for code efficiency

and performance. It contains 21 internal registers (six of them directly addressable in each

execution context), 20 addressing modes including indexed indirect and relative addressing

and 80 instructions.

5.2.1

Architecture and registers



Harvard architecture with 3-stage pipeline



32-bit wide program memory bus with 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 with 16-Mbyte linear memory space



16-bit stack pointer with access to a 64-Kbyte stack



8-bit condition code register with seven condition flags updated with the results of last

executed instruction

5.2.2

Addressing



20 addressing modes



Indexed indirect addressing mode for lookup tables located in the entire address space



Stack pointer relative addressing mode for efficient implementation of local variables

and parameter passing

5.2.3

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 the stack and accumulator (push/pop) with direct stack access



Data transfer using the X and Y registers or direct memory-to-memory transfers

5.2.4

Single wire interface module (SWIM)

The single wire interface module (SWIM), together with the integrated debug module (DM),

permits non-intrusive, real-time in-circuit debugging and fast memory programming. The

interface can be activated in all device operation modes and can be connected to a running

device (hot plugging).The maximum data transmission speed is 145 byte/ms.

The SWIM pin is a multifunction signal. For further details refer to Table 8: Port P2 I/O

multiplexing signal in Section 7.4 on page 39.

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