MPC5643LF0VMM8 datasheet(13/98 Pages) FREESCALE

13 / 98 page

Overview

MPC5643L Microcontroller Data Sheet, Rev. 3

Preliminary—Subject to Change Without Notice

Freescale Semiconductor

•

Input frequency range 4–40 MHz

•

Crystal input mode

•

External reference clock (3.3 V) input mode

•

PLL reference

1.3.16

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

PLL

•

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

case XOSC fails

1.3.17

Clock, reset, power, mode and test control module

The Clock, Reset, Power, Mode and Test control module has the following features:

•

Clock gating and clock distribution control

•

Halt, stop mode control

•

Flexible configurable System and auxiliary clock dividers

•

Various execution modes

— Reset, Idle, Test, Safe

— Various RUN modes with software selectable powered modules

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

1.3.18

Periodic Interrupt Timer Module (PIT)

The PIT module implements the following features:

•

Four general purpose interrupt timers

•

32-bit counter resolution

•

32-bit counter for real time interrupt, clocked from main external oscillator

•

Can be used for software tick or DMA trigger operation

1.3.19

System Timer Module (STM)

The STM implements the following features:

•

Up-counter with four output compare registers

•

OS task protection and hardware tick implementation per AutoSar requirement

The STM is replicated for each processor.

1.3.20

Software Watchdog Timer (SWT)

This module implements the following features:

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