AT83EB5114 datasheet(11/95 Pages) ATMEL

部件名	AT83EB5114

功能描述	Low-pin-count 8-bit microcontroller with A/D converter

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制造商	ATMEL [ATMEL Corporation]

网页	http://www.atmel.com

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AT89/83EB5114

4311C–8051–02/08

Clock System

Overview

The AT8xEB5114 oscillator system provides a reliable clocking system with full master-

ing of speed versus CPU power trade-off. Several clock sources are possible:

•

External clock input

•

High speed crystal or ceramic oscillator

•

Integrated accurate oscillator with external R and C.

•

Low power consumption Integrated RC oscillator without external components.

The AT8xEB5114 needs 6 clock periods per machine cycle when the X2 function is set.

However, the selected clock source can be divided by 2-32 before clocking the CPU and

the peripherals.

By default, the active oscillator after reset is the high speed crystal/ceramic oscillator.

Any two bits in a hardware configuration byte programmed by a Flash programmer or by

metal mask can activate any other one.

The clock system is controlled by several SFR registers: CKCON, CKSEL, CKRL,

OSCON, PCON and HSB which is the hardware security byte.

Blocks Description

The AT8xEB5114 includes three oscillators:

•

Crystal oscillator optimized for 24 MHz.

•

1 accurate oscillator with a typical frequency of 12 MHz.

•

1 low power oscillator with a typical frequency of 14 MHz.

Figure 4. Functional Block Diagram

Xtal2

Xtal1

PwdOsc

CKRL

2 down to 32

Prescaler-Divider

11

10

OscOut

Xtal_Osc

RC_Osc

OSCBEN

OSCAEN

CKS

X2

0

1

Mux

Filter

+

OSCA

OSCB

CkIdle

Ck

Idle

CPU Clock

Peripherals Clock

Pwd

CkOut

CkAdc

Quiet

A/D Clock

R

RC_Osc

OSCC

C

Freq. Adjust

LCKEN

OSCCEN

OSCBRY

01

类似零件编号 - AT83EB5114

制造商	部件名	数据表	功能描述
ATMEL Corporation	AT83EB5114	1Mb / 95P	Low-pin-count 8-bit microcontroller with A/D converter
	AT83EB5114XXXTGRIL	1Mb / 95P	Low-pin-count 8-bit microcontroller with A/D converter
	AT83EB5114	950Kb / 95P	4 Kbytes ROM or 4 Kbytes Flash Program Memory

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