APPLICATION EXAMPLES

5.0 Introduction

The following chapter is organized in two sections, Hardware and Software. The hardware section gives examples of some typical configurations of MCS-48 compon- ents while software section gives assembly language listings of some common appli- cations routines.

5.1 Hardware Examples

CRYSTAL OSCILLATOR MODE

 

r-----

XTAll

 

I

 

< 15 pF

I

 

I

 

(INCLUDES XTAL,

L

 

SOC~ET, STRAY)

..

 

I

 

 

 

 

I

 

 

IL ____ _

 

15-25pF I

(INCLUDES SOCKET, STRAY) ":'

CRYSTAL SERIES RESISTANCE SHOULD BE <7512 AT 6 MHz; <1601l AT 3.6 MHz.

DRIVING FROM EXTERNAL SOURCE

+5V

47012

Jo - 4 ------ '"2~ XTAll

+5V

47012

L---'--~XTAL2

BOTH XTAll AND XTAl2 SHOULD BE DRIVEN. RESISTORS TO Vee ARE NEEDED TO ENSURE V,H =3.8V

IF TTL CIRCUITRY IS USED.

NOTE:

A STANDARD SERIES RESONANT XTAL SUCH AS CTS KNIGHTS MP060 OR CRYSTEK CY6B WILL PROVIDE BETTER THAN .1% FRE· QUENCY ACCURACY.

EACH C SHOULD BE APPROXIMATELY 20pF,

INCLUDING STRAY CAPACITANCE. FOR

MORE INFORMATION ON XTALS SEE INTEl-

APPLICATION NOTE AP.35.

FREQUENCY REFERENCE OPTIONS

LC OSCILLATOR MODE

--"- J;.. NOMINAL'

45 .H 20 pF 5.2 MHz

12O.H 20pF 3.2 MHZ..--_..-_-42 XTAll

C' - C+3Cpp

- 2

L---_~_~3 XTAl2

Cpp " 5 - 10 pF PlN·TO·PIN

CAPACITANCE

 

EACH C SHOULD BE APPROXIMATELY 20 pF. INCLUDING STRAY CAPACITANCE.

NOTE: SEE PAGE 5·3FOR 6021

FREQUENCY REFERENCES.

5·1

Page 112
Image 112
Intel mcs-48 manual Introduction, Crystal Oscillator Mode, Driving from External Source, LC Oscillator Mode