STLUX385ATR datasheet(16/99 Pages) STMICROELECTRONICS

16 / 99 page

Product overview

STLUX385A

16/98

DocID024387 Rev 2

3.2.1

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

3.2.2

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

3.2.3

Instruction set

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80 instructions with 2-byte average instruction size

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Standard data movement and logic/arithmetic functions

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8-bit by 8-bit multiplication

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16-bit by 8-bit and 16-bit by 16-bit division

•

Bit manipulation

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Data transfer between stack and accumulator (push/pop) with direct stack access

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

3.2.4

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.

3.2.5

Debug module

The non-intrusive debugging module features a performance close to a full-featured

emulator. Besides memory and peripheral operation, CPU operation can also be monitored

in real-time by means of shadow registers.

•

R/W of RAM and peripheral registers in real-time

•

R/W for all resources when the application is stopped

•

Breakpoints on all program-memory instructions (software breakpoints), except for the

interrupt vector table

•

Two advanced breakpoints and 23 predefined breakpoint configurations

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