MAC7200 datasheet(138/976 Pages) FREESCALE

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Clocks Introduction

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

Figure 5-1. MAC72xx Clock Tree

The MCU’s clocks can be supplied in a variety of ways, enabling a range of system operating frequencies

to be supported:

•

From the on-board Phase Locked Loop (PLL) in normal functional mode

•

From the PLL in Self Clock Mode (SCM)

•

Directly from the Oscillator

The FlexCAN modules may be configured to have their clock sources derived either from the Peripheral

Bus Clock or directly from the Oscillator Clock. This allows the user to select the CAN clock based on the

required jitter performance. Consult Chapter 28, “FlexCAN2” for more details on the operation and

configuration of the CAN modules.

The Real Time Interrupt (RTI) (in the Periodic Interrupt Timer module) and the Software Watchdog Timer

(SWT) (in the MCM module) can also be configured to run from either the Oscillator Clock or the PLL

CRG

System Clock

XTAL

EXTAL

ARM7 TDMI-S

IIC

RAM

Flash

eMIOS

ESCI_A, ESCI_B

CAN_A, CAN_B

CORE

eDMA

INT C

PLL

MUX

Oscillator

PIT

SWT

PLLCLK

OSCCLK

Shadow Block

Peripheral Bus Clock

Main Array

DSPI_A, DSPI_B,

DSPI_C

ATD_A

MAC7200 Datasheet(PDF) 138 Page - Freescale Semiconductor, Inc

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