STLUX datasheet(15/126 Pages) STMICROELECTRONICS

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STLUX

Product overview

126

Product overview

Section 5.1 describes the features implemented in the product device.

5.1

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 generates 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

only by a simple timer. This mechanism allows to generate controlled high frequency PWM

signals.

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

controller, the SMED can operate without any software interaction.

The STLUX family 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 described here below:



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 an

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 the processor interface



Eight interrupt request lines

5.1.1

SMED coupling schemes

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

independence of each “Finite State Machine” (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 STLUX supports the following coupled configuration

schemes:



Single SMED configuration



Synchronous coupled SMEDs



Asynchronous coupled SMEDs



Synchronous two coupled SMEDs



Asynchronous two coupled SMEDs



External controlled SMED

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