MPC5643L datasheet(13/136 Pages) NXP

13 / 136 page

Introduction

MPC5643L Microcontroller Data Sheet, Rev. 10

NXP Semiconductors

1.5.15

Main oscillator

The main oscillator provides these features:

•

Input frequency range 4–40 MHz

•

Crystal input mode

•

External reference clock (3.3 V) input mode

•

FMPLL reference

1.5.16

Internal Reference Clock (RC) oscillator

The architecture uses constant current charging of a capacitor. The voltage at the capacitor is compared to the stable bandgap

reference voltage. The RC oscillator is the device safe clock.

The RC oscillator provides these features:

•

Nominal frequency 16 MHz

•

±5% variation over voltage and temperature after process trim

•

Clock output of the RC oscillator serves as system clock source in case loss of lock or loss of clock is detected by the

FMPLL

•

RC oscillator is used as the default system clock during startup and can be used as back-up input source of FMPLL(s)

in case XOSC fails

1.5.17

Clock, reset, power, mode and test control modules (MC_CGM,

MC_RGM, MC_PCU, and MC_ME)

These modules provide the following:

•

Clock gating and clock distribution control

•

Halt, stop mode control

•

Flexible configurable system and auxiliary clock dividers

•

Various execution modes

— HALT and STOP mode as reduced activity low power mode

— Reset, Idle, Test, Safe

— Various RUN modes with software selectable powered modules

— No stand-by mode implemented (no internal switchable power domains)

1.5.18

Periodic Interrupt Timer Module (PIT)

The PIT module implements the following features:

•

4 general purpose interrupt timers

•

32-bit counter resolution

•

Can be used for software tick or DMA trigger operation

1.5.19

System Timer Module (STM)

The STM implements the following features:

•

Up-counter with 4 output compare registers

•

OS task protection and hardware tick implementation per AUTOSAR1 requirement

1.Automotive Open System Architecture

MPC5643L Datasheet(PDF) 13 Page - NXP Semiconductors

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