HCS08 datasheet(22/290 Pages) MOTOROLA

tên linh kiện	HCS08

Giải thích chi tiết về linh kiện	Microcontrollers

PDF	290 Pages

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nhà sản xuất	MOTOROLA [Motorola, Inc]

Trang chủ	http://www.freescale.com

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Introduction

MC9S08GB/GT

MOTOROLA

Some of the modules inside the MCU have clock source choices. Figure 1-3 shows a simplified clock

connection diagram. The ICG supplies the clock sources:

•

ICGOUT is an output of the ICG module. It is either:

–

The external crystal oscillator

–

An external clock source

–

The output of the digitally-controlled oscillator (DCO) in the frequency-locked loop

sub-module

Control bits inside the ICG determine which source is connected.

•

FFE is a control signal generated inside the ICG. If the frequency of ICGOUT > 4

× the frequency

of ICGERCLK, this signal is a logic 1 and the fixed-frequency clock will be the ICGERCLK.

Otherwise the fixed-frequency clock will be BUSCLK.

•

ICGLCLK — Development tools can select this internal self-clocked source (~ 8 MHz) to speed up

BDC communications in systems where the bus clock is slow.

•

ICGERCLK — External reference clock can be selected as the real-time interrupt clock source.

HCS08 bảng dữ liệu(PDF) 22 Page - Motorola, Inc