参数资料
型号: MC68HC05V12CFNR2
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 65/135页
文件大小: 2080K
代理商: MC68HC05V12CFNR2
General Description
Functional Pin Descriptions
MC68HC05V12 Rev. 2.0
Technical Data
MOTOROLA
General Description
29
NON-DISCLOSURE
AGREEMENT
REQUIRED
1.6.5 OSC1 and OSC2
The OSC1 and OSC2 pins are the connections for the on-chip oscillator.
OSC1 is the input to the oscillator inverter. The output (OSC2) will
always reflect OSC1 inverted except when the device is in stop mode
which forces OSC2 high.
The OSC1 and OCS2 pins can accept these sets of components:
1. A crystal as shown in Figure 1-3(a)
2. A ceramic resonator as shown in Figure 1-3(a)
3. An external clock signal as shown in Figure 1-3(b)
The frequency, fOSC, of the oscillator or external clock source is divided
by two to produce the internal operating frequency, fOP.
Figure 1-3. Oscillator Connections
1.6.5.1 Crystal Oscillator
The circuit in Figure 1-3(a) shows a typical oscillator circuit for an AT-
cut, parallel resonant crystal.
NOTE:
The crystal manufacturer’s recommendations should be followed, as the
crystal parameters determine the external component values required to
provide maximum stability and reliable startup.
(a) Crystal or Ceramic
Resonator Connections
UNCONNECTED
EXTERNAL CLOCK
(b) External Clock
Source Connection
OSC1
OSC2
MCU
20 pF *
4 MHz*
10 M
*
*Values shown are typical. For further information, consult the crystal oscillator vendor.
MCU
OSC1
OSC2
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