參數(shù)資料
型號(hào): MC68HC08LT8
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 52/156頁
文件大?。?/td> 1030K
代理商: MC68HC08LT8
Oscillator (OSC)
MC68HC08LT8 Data Sheet, Rev. 1
52
Freescale Semiconductor
Figure 5-1. Oscillator External Connections
The series resistor (R
S
) is included in the diagram to follow strict Pierce oscillator guidelines and may not
be required for all ranges of operation, especially with high frequency crystals. Refer to the crystal
manufacturer’s data for more information.
5.3 I/O Signals
The following paragraphs describe the oscillator I/O signals.
5.3.1 Crystal Amplifier Input Pin (OSC1, XTAL1)
OSC1 and XTAL1 pin are input to the crystal oscillator amplifier. Schmitt trigger and glitch filter are
implemented on this pin in order to improve the EMC performance. See
Chapter 16 Electrical
Specifications
for detail specification of the glitch filter.
5.3.2 Crystal Amplifier Output Pin (OSC2 & XTAL2)
OSC2 or XTAL2 pin is the output of the crystal oscillator inverting amplifier.
5.3.3 Oscillator Enable Signal (SIMOSCEN)
The SIMOSCEN signal from the system integration module (SIM) enables/disables the x-tal oscillator
circuit.
C
1
C
2
R
B1
X
1
*R
can be zero (shorted) when used with higher-frequency crystals.
Refer to manufacturer’s data.
See
Chapter 16
for component value requirements.
MCU
OSC2
OSC1
SIMOSCEN
From SIM
STOP_XCLKEN
CONFIG2
OSCXCLK
To all Modules
C
3
C
4
R
B2
X
2
R
S
2
*
XTAL2
XTAL1
32KXCLK
To LCD and PPI Modules
STOP_XTALEN
CONFIG2
1–16MHz
32.768kHz
R
S
1
*
÷ 2
CGMXCLK
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