參數(shù)資料
型號(hào): MC68L11F1CFN3
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, EEPROM, MICROCONTROLLER, PQCC68
封裝: PLASTIC, LCC-68
文件頁數(shù): 85/174頁
文件大?。?/td> 981K
代理商: MC68L11F1CFN3
MOTOROLA
PIN DESCRIPTIONS
MC68HC11F1
2-4
TECHNICAL DATA
The XTAL pin is normally left unterminated when an external CMOS compatible clock
is connected to the EXTAL pin. However, a 10 k
to 100 k load resistor connected
from the XTAL output to ground can be used to reduce RFI noise emission.
The XTAL output is normally used to drive a crystal. The XTAL output can be buffered
with a high-impedance buffer, or it can be used to drive the EXTAL input of another
M68HC11 device. Refer to Figure 2-6.
In all cases, use caution when designing circuitry associated with the oscillator pins.
Load capacitances shown in the oscillator circuits include all stray layout capacitanc-
Figure 2-4 Common Crystal Connections
Figure 2-5 External Oscillator Connections
Figure 2-6 One Crystal Driving Two MCUs
EXTAL
XTAL
25 pF
*
Values include all stray capacitances.
*
25 pF
*
10M
4 x E
CRYSTAL
MCU
NC OR
10 k – 100 k
LOAD
XTAL
EXTAL
MCU
CMOS-COMPATIBLE
EXTERNAL
OSCILLATOR
EXTAL
XTAL
25 pF
*
Values include all stray capacitances.
*
25 pF
*
10M
4 x E
CRYSTAL
NC OR
10 k – 100 k
LOAD
XTAL
EXTAL
SECOND
220
MCU
FIRST
MCU
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