STMPE1601_1 datasheet(41/61 Pages) STMICROELECTRONICS

Part #	STMPE1601

Description	16-bit enhanced port expander with keypad and PWM controller Xpander Logic

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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STMPE1601

Basic PWM controller

41/61

11.1

Interrupt on basic PWM controller

A basic PWM controller can be programmed to generate interrupts at the completion of a

blinking sequence. However, there are some limitations:

a)

Each basic PWM controller has its own bit in the interrupt enable/status registers.

b)

If enabled, completion in any of the PWM controller triggers interrupts. No interrupt

will be generated if infinite repetition is set.

c)

In WDT mode, an interrupt is generated when timeout occurs

d)

In One-shot mode

If Auto-reload, interrupt is generated every time a valid trigger is detected

If Non-auto-reload, an interrupt is generated just once

11.2

Trigger feature

The basic PWM controller can be programmed to be controlled by an external “trigger”

signal. This feature can be used to implement:

–

One-shot trigger circuit

–

Watchdog timer

In one-shot trigger mode, a single pulse which the length is defined by TIMING[3:0] is sent

to the PWM output, when a level transition is detected at the trigger source.

In watchdog mode, a 120

μS pulse is generated at PWM output when the programmed timer

has elapsed without getting any trigger for the trigger source.

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