mc68hc05j5ap Freescale Semiconductor, Inc, mc68hc05j5ap Datasheet - Page 91

• Manufacturer Part Number: mc68hc05j5ap
• Description: General Description The Mc68hc05j5a Is A Member Of The Low-cost High-performance M68hc05 Family Of 8-bit Microcontroller Units Mcus . The M68hc05 Family Is Based On The Customer-speci Ed Integrated Circuit Design Strategy. All Mcus In The Family
• Manufacturer: Freescale Semiconductor, Inc

A.1
A.2
REV 2.1
This appendix describes the MC68HRC05J5A, a resistor-capacitor (RC) oscillator
mask option version of the MC68HC05J5A. The entire MC68HC05J5A data sheet
applies to the MC68HRC05J5A, with exceptions outlined in this appendix.
INTRODUCTION
The MC68HRC05J5A is a resistor-capacitor (RC) oscillator mask option version
of the MC68HC05J5A. The MC68HRC05J5A is functionally identical to the
MC68HC05J5A with the exception that the MC68HRC05J5A supports the RC
oscillator only, as outlined in Appendix A.2.
RC OSCILLATOR CONNECTIONS
This is the only oscillator option supported by the MC68HRC05J5A device.
On the MC68HRC05J5A device, an external resistor is connected between
OSC2/R pin and the V
quency f
Figure A-2 to select the value of R for the required oscillator frequency.
The tolerance of this RC oscillator is guaranteed to be no greater than 15% at
the specified conditions of 0 C to 40 C and 5V 10% V
ance of the external resistor R is at most 1% and the center frequency range is
from 3.8MHz to 4.2MHz. The center frequency is the nominal operating frequency
of the RC oscillator and can be adjusted by adjusting the external R value to
change the internal VCO charging current.
In order to obtain an oscillator clock with the best possible tolerance, the external
resistor connected to the OSC2/R pin should be grounded as close to the VSS pin
as possible and the other terminal of this external resistor should be connected as
close to the OSC2/R pin as possible.
OSC
is set at 4MHz with the external R tied to V
Freescale Semiconductor, Inc.
Figure A-1. RC Oscillator Connections
For More Information On This Product,
SS
Go to: www.freescale.com
pin as shown in Figure A-1. The typical operating fre-
MC68HRC05J5A
APPENDIX A
July 16, 1999
OSC1
R
MCU
OSC2/R
GENERAL RELEASE SPECIFICATION
DD
providing that the toler-
SS
. Use the graph in
A-1