參數(shù)資料
型號(hào)： MC68HC11A0FB4
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： ROM-based high-performance microcontrollers
中文描述： 基于ROM的高性能微控制器
文件頁(yè)數(shù)： 15/124頁(yè)
文件大?。?/td> 840K
代理商： MC68HC11A0FB4
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PIN DESCRIPTIONS
TECHNICAL DATA
2-3
constant can cause the device to misinterpret the type of reset that occurred. Refer to
SECTION 5 RESETS AND INTERRUPTS
for further information.
Figure 2-3
illustrates a reset circuit that uses an external switch. Use a low voltage
interrupt circuit, however, to prevent corruption of RAM.
Figure 2-3 External Reset Circuit
2.3 Crystal Driver and External Clock Input (XTAL, EXTAL)
These two pins provide the interface for either a crystal or a CMOS compatible clock
to control the internal clock generator circuitry. The frequency applied to these pins is
four times higher than the desired E-clock rate.
The XTAL pin is normally left unterminated when an external CMOS compatible clock
input is connected to the EXTAL pin. However, a 10 k
to 100 k
load resistor con-
nected from XTAL to ground can be used to reduce RFI noise emission. The XTAL
output is normally intended to drive only 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.
In all cases, use caution around the oscillator pins. Load capacitances shown in the
oscillator circuits include all stray layout capacitances. Refer to
Figure 2-4
,
Figure 2-
5
, and
Figure 2-6
.
Figure 2-4 Common Crystal Connections
EXT RESET CIRCUIT
4.7 k
TO RESET
OF M68HC11
VDD
MC34(0/1)64
GND
RESET
IN
2
1
3
VDD
10 M
*
THIS VALUE INCLUDES ALL STRAY CAPACITANCES.
MCU
25 pF
*
25 pF
*
EXTAL
XTAL
4 x E
CRYSTAL
COMMON XTAL CONN
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
相關(guān)PDF資料
PDF描述
MC68HC11A0FN1 ROM-based high-performance microcontrollers
MC68HC11A0FN3 ROM-based high-performance microcontrollers
MC68HC11A0FN4 ROM-based high-performance microcontrollers
MC68HC11A0FU ROM-based high-performance microcontrollers
MC68HC11A0FU1 ROM-based high-performance microcontrollers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC11A0FN 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers
MC68HC11A0FN1 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers
MC68HC11A0FN3 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers
MC68HC11A0FN4 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers
MC68HC11A0FU 制造商:Motorola Inc 功能描述:
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