參數(shù)資料
型號: MC68HC711A0FB
廠商: 飛思卡爾半導(dǎo)體(中國)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
文件頁數(shù): 16/124頁
文件大?。?/td> 840K
代理商: MC68HC711A0FB
PIN DESCRIPTIONS
2-4
TECHNICAL DATA
Figure 2-5 External Oscillator Connections
Figure 2-6 One Crystal Driving Two MCUs
2.4 E-Clock Output (E)
E is the output connection for the internally generated E clock. The signal from E is
used as a timing reference. The frequency of the E-clock output is one fourth that of
the input frequency at the XTAL and EXTAL pins. When E-clock output is low, an in-
ternal process is taking place. When it is high, data is being accessed. All clocks, in-
cluding the E clock, are halted when the MCU is in STOP mode. The E clock can be
turned off in single-chip modes to reduce the effects of radio frequency interference
(RFI).
2.5 Interrupt Request (IRQ)
The IRQ input provides a means of applying asynchronous interrupt requests to the
MCU. Either negative edge-sensitive triggering or level-sensitive triggering is program
selectable (OPTION register). IRQ is always configured to level-sensitive triggering at
reset. Connect an external pullup resistor, typically 4.7 k
, to V
DD
when IRQ is used
in a level sensitive wired-OR configuration.
2.6 Non-Maskable Interrupt (XIRQ)
The XIRQ input provides a means of requesting a nonmaskable interrupt after reset
initialization. During reset, the X bit in the condition code register (CCR) is set and any
interrupt is masked until MCU software enables it. Because the XIRQ input is level-
NC
MCU
EXTAL
XTAL
4 x E
CMOS-COMPATIBLE
EXTERNAL OSCILLATOR
EXT EXTAL CONN
10 M
*
THIS VALUE INCLUDES ALL STRAY CAPACITANCES.
FIRST
MCU
25 pF
*
25 pF
*
EXTAL
XTAL
4 x E
CRYSTAL
DUAL-MCU XTAL CONN
NC
SECOND
MCU
EXTAL
XTAL
220
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
MC68HC711Ex APPENDIX A ELECTRICAL CHARACTERISTICS
MC68HC711K4VFN2 8-BIT MICROCONTROLLER
MC68HC711K4VFN3 8-BIT MICROCONTROLLER
MC68HC711K4VFN4 8-BIT MICROCONTROLLER
MC68HC711K4VFS2 8-BIT MICROCONTROLLER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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