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参数资料
型号： MC68HC11F1VPU2
厂商： MOTOROLA INC
元件分类： 微控制器/微处理器
英文描述： Technical Summary 8-Bit Microcontroller
中文描述： 8-BIT, EEPROM, 2 MHz, MICROCONTROLLER, PQFP80
封装： 14 X 14 MM, 1.40 MM HEIGHT, PLASTIC, LQFP-80
文件页数： 73/163页
文件大小： 711K
代理商： MC68HC11F1VPU2
MC68HC11F1
PIN DESCRIPTIONS
MOTOROLA
TECHNICAL DATA
2-3
2.2 Reset (RESET)
An active low bidirectional control signal, RESET, acts as an input to initialize the MCU
to a known start-up state. It also acts as an open-drain output to indicate that an inter-
nal failure has been detected in either the clock monitor or COP watchdog circuit. The
CPU distinguishes between internal and external reset conditions by sensing whether
the reset pin rises to a logic one in less than two E-clock cycles after a reset has oc-
curred. It is not advisable to connect an external resistor-capacitor (RC) power-up de-
lay circuit to the reset pin of M68HC11 devices because the circuit charge time
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. Other circuits can be
used, however, it is important to incorporate a low voltage interrupt (LVI) circuit to pre-
vent operation at insufficient voltage levels which could result in erratic behavior or cor-
ruption of RAM.
Figure 2-3 External Reset Circuit
2.3 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 EXTAL pin. When E-clock output is low, an internal process
is taking place. When it is high, data is being accessed. All clocks, including 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). Refer to
SECTION 9 TIMING SYSTEM.
2.4 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. Either a crystal oscillator or a CMOS
compatible clock can be used. The resulting E-clock rate is the input frequency divided
by four.
MANUAL
RESET SWITCH
4.7 k
TO RESET
OF M68HC11
4.7 k
VDD
MC34064
IN
GND
2
3
1
RESET
1.0
F
4.7 k
VDD
MC34164
IN
GND
2
3
1
RESET
OPTIONAL POWER-ON DELAY
AND MANUAL RESET SWITCH
相关PDF资料
PDF描述
MC68HC11F1VPU3 Technical Summary 8-Bit Microcontroller
MC68HC11F1VPU4 Technical Summary 8-Bit Microcontroller
MI-QC211-MWY Military DC-DC Power Supplies
MI-QC211-MXY Military DC-DC Power Supplies
MI-QC211-MYY Military DC-DC Power Supplies
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