參數(shù)資料
型號: MC68HC08LT8CFGE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP44
封裝: 10 X 10 MM, 1.40 MM THICKNESS, 0.80 MM PITCH, ROHS COMPLIANT, MS-026BCB, LQFP-44
文件頁數(shù): 105/156頁
文件大小: 1107K
代理商: MC68HC08LT8CFGE
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.
C1
C2
RB1
X1
*R
S can be zero (shorted) when used with higher-frequency crystals.
MCU
Refer to manufacturer’s data.
OSC2
OSC1
See Chapter 16 for component value requirements.
SIMOSCEN
From SIM
STOP_XCLKEN
CONFIG2
OSCXCLK
To all Modules
C3
C4
RB2
X2
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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