Pit Driver - Freescale Semiconductor DSP56800E User Manual

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PIT Driver

This section describes the API of MC56F802x/3x and MC56F800x Periodic Interrupt Timer

(PIT) on-chip module. The functionality of the PIT module itself is described in the 56F802x/3x

Peripheral Reference Manual and 56F800x Peripheral Reference Manual.

Introduction

The MC56F802x/3x devices have up to three Periodic Interval Timer modules and MC56F800x

devices have one Periodic Interval Timer module. Each PIT module contains a 16-bit up counter,

a modulo register, and a control register. The modulo and control registers are read/writable. The

counter is read only. The modulo register is loaded with a value to count to and the pre-scaler is

set to determine the counting rate. When enabled, the counter counts up to the modulo value and

sets a flag (and an interrupt request if enabled), then it resets to $0000, and resumes counting.

This section describes the PIT driver software, providing the low level software layer interfacing

hardware with software.

Quick Reference

This section is intended as a source of quick access information, while the details are discussed in

Section 5.21.3.

Module base address

PIT (PIT_BASE)

PIT_0 (PIT0_BASE)

PIT_1 (PIT1_BASE)

PIT_2 (PIT2_BASE)

API Definition

The following header files are needed in order to use the PIT device driver:

Required Header File(s):

#include "qs.h"

#include "pit.h"

The following information may be found in the header file pit.h.

FREESCALE SEMICONDUCTOR

Table 5-779. PIT Module Base Address

Targeting 56F8xxx Platform

MC56F802x/3x

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