參數(shù)資料
型號(hào)： MC68HC705J5ACDWR2
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封裝： SOIC-20
文件頁數(shù)： 4/106頁
文件大?。?/td> 1069K
代理商： MC68HC705J5ACDWR2
July 16, 1999
GENERAL RELEASE SPECIFICATION
MC68HC05J5A
MOTOROLA
REV 2.1
C-1
APPENDIX C
MC68HRC705J5A
This appendix describes the MC68HRC705J5A, the emulation part for
MC68HRC05J5A, and a resistor-capacitor (RC) oscillator mask option version of
the MC68HC705J5A. The entire MC68HC05J5A data sheet and appendix B
applies to the MC68HRC705J5A, with exceptions outlined in this appendix.
C.1
INTRODUCTION
The MC68HRC705J5A is a resistor-capacitor (RC) oscillator mask option version
of the MC68HC705J5A (see Appendix B). The MC68HRC705J5A is functionally
identical to the MC68HC705J5A with the exception that the MC68HRC705J5A
supports the RC oscillator only, as outlined in Appendix C.2.
The MC68HRC705J5A is not available in the 16-pin SOIC package.
C.2
RC OSCILLATOR CONNECTIONS
This is the only oscillator option supported by the MC68HRC705J5A device.
On the MC68HRC705J5A device, an external resistor is connected between
OSC2/R pin and the VSS pin as shown in Figure C-1. The typical operating fre-
quency fOSC is set at 4MHz with the external R tied to VSS. Use the graph in
Figure C-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 specied conditions of 0
°C to 40°C and 5V ±10% V
DD providing that the toler-
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.
Figure C-1. RC Oscillator Connections
MCU
OSC2/R
OSC1
R
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參數(shù)描述
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