Datasheet

111

SAM9G45 [DATASHEET]

Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15

14. Periodic Interval Timer (PIT)

14.1 Description

The Periodic Interval Timer (PIT) provides the operating system’s scheduler interrupt. It is designed to offer

maximum accuracy and efficient management, even for systems with long response time.

14.2 Embedded Characteristics

 Includes a 20-bit Periodic Counter, with less than 1µs accuracy

 Includes a 12-bit Interval Overlay Counter

 Real-time OS or Linux/WinCE compliant tick generator

14.3 Block Diagram

Figure 14-1. Periodic Interval Timer

20-bit

Counter

MCK/16

PIV

PIT_MR

CPIV

PIT_PIVR

PICNT

12-bit

Adder

read PIT_PIVR

CPIV PICNT

PIT_PIIR

PITS

PIT_SR

set

reset

PITIEN

PIT_MR

pit_irq

MCK

Prescaler

= ?