STLUX385ATR datasheet(17/99 Pages) STMICROELECTRONICS

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DocID024387 Rev 2

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STLUX385A

Product overview

3.3

Basic peripherals

The following sections describe the basic peripherals accessed by the internal CPU

controller.

3.3.1

Vectored interrupt controller

•

Nested interrupts with three software priority levels

•

21 interrupt vectors with hardware priority

•

Two vectors for 12 external maskable or un-maskable interrupt request lines

•

Trap and reset interrupts

3.3.2

Timers

The STLUX385A device provides several timers which are used by software and do not

interact directly with the SMED and the PWM generation.

System timers

The system timer consists of a 16-bit auto-reload counter driven by a programmable

prescaled clock and operating in one shoot or free running operating mode. The timer is

used to provide the IC time base system clock, with interrupt generation on timer overflow

events.

Auxiliary timer

The auxiliary timer is a light timer with elementary functionality. The time base frequency is

provided by the CCO clock logic (configurable with different source clock and prescale

division factors), while the interrupt functionality is supplied by an interrupt edge detection

logic similarly to the solution adopted for Port P0/P2.

The timer has the following main features:

•

Free running mode

•

Up counter

•

Timer prescaler 8-bit

•

Interrupt timer capability:

–

Vectored interrupt

–

Interrupt IRQ/NMI or Polling mode

•

Timer pulse configurable as a clock output signal via CCO primary pin

Thanks to the great configurability of the CCO frequency, the timer can cover a wide range

of interval time to fit better the target application requirements.

Auto-wakeup timer

The AWU timer is used to cyclically wake up the IC device from the active-halt state. The

AWU frequency time base f

AWU

can be selected between the following clock sources: LSI

(153.6 kHz) and the external clock HSE scaled down to 128 kHz clock.

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