STLUX385A datasheet(12/99 Pages) STMICROELECTRONICS

12 / 99 page

Product overview

STLUX385A

12/98

DocID024387 Rev 2

Product overview

This following section describes the features implemented in the product device.

3.1

SMED (state machine event driven): configurable PWM

generator

The SMED is an advanced programmable PWM generator signal. The SMED (state

machine event driven) is a state machine device controllable by both external events

(primary I/O signals) and internal events (counter timers), which generate an output signal

(PWM) depending on the evolution of the internal state machine.

The PWM signal generated by the SMED is therefore shaped by external events and not by

a single timer. This mechanism allows controlled high frequency PWM signals to be

generated.

The SMED is also autonomous: once it has been configured by the STLUX385A internal

controller, the SMED can operate without any software interaction.

STLUX385A provides 6 SMED units. Multiple SMEDs can operate independently from each

other or they can be grouped together to form a more powerful state machine.

The main features of a SMED are here below described:

•

Configurable state machine generating a PWM signal

•

More than 10.4 ns PWM native resolution

•

Up to 1.3 ns PWM resolution when using SMED dithering

•

6 states available in each SMED: IDLE, S0, S1, S2, S3 plus a special HOLD state

•

Transactions triggered by synchronous and asynchronous external events or internal

timer

•

Each transaction can generate an interrupt

•

Fifteen registers available to configure the state machine behavior

•

Four 16-bit configurable time registers, one for each running state (T0, T1, T2, T3)

•

Internal resources accessible through processor interface

•

Eight interrupt request lines

3.1.1

SMED coupling schemes

The SMED coupling extends the capability of the single SMED, preserving the

independence of each FSM programmed state evolution. The coupling scheme allows the

SMED pulse signals to be interleaved on their own PWM or on a merged single PWM

output. The STLUX385A supports the following coupled configuration schemes:

•

Single SMED configuration

•

Synchronous coupled SMED

•

Asynchronous coupled SMED

•

Synchronous two coupled SMED

•

Asynchronous two coupled SMED

•

External controlled SMED

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