MEC1322 datasheet(328/456 Pages) MICROCHIP

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MEC1322

DS00001719D-page 328

 2014 - 2015 Microchip Technology Inc.

28.3

Signal Description

28.4

Host Interface

The blinking/breathing PWM block is accessed by a controller over the standard register interface.

28.5

Power, Clocks and Reset

This section defines the Power, Clock, and Reset parameters of the block.

28.5.1

POWER DOMAINS

28.5.2

CLOCK INPUTS

28.5.3

RESETS

28.6

Interrupts

Each PWM can generate an interrupt. The interrupt is asserted for one 48 MHz clock period whenever the PWM WDT

times out. The PWM WDT is described in Section 28.8.3.1, "PWM WDT," on page 332.

TABLE 28-1:

SIGNAL DESCRIPTION

Name

Direction

Description

PWM Output

Output

Output of PWM

By default, the PWM pin is configured to be active high: when the

PWM is configured to be fully on, the pin is driving high. When the

PWM is configured to be fully off, the pin is low. If firmware requires

the Blinking/Breathing PWM to be active low, the Polarity bit in the

GPIO Pin Control Register associated with the PWM can be set to

1, which inverts the output polarity.

TABLE 28-2:

POWER SOURCES

Name

Description

VCC1

Main power. The source of main power for the device is system

dependent.

TABLE 28-3:

CLOCK INPUTS

Name

Description

32KHz_Clk

32.768 KHz clock

48 MHz Ring Oscillator

48 MHz clock

TABLE 28-4:

RESET SIGNALS

Name

Description

VCC1_RESET

Block reset

Note:

PWM_WDT[0], PWM_WDT[1], PWM_WDT[2], PWM_WDT[3] bits in the GIRQ17 and GIRQ18 registers

are the interrupt source bits for the three instances of the Blinking/Breathing PWM in the MEC1322.

TABLE 28-5:

EC INTERRUPTS

Source

Description

PWM_WDT

PWM watchdog time out

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