參數(shù)資料
型號: MC68HC05P18A
廠商: Motorola, Inc.
英文描述: Low Cost HCMOS Microcontroller(低成本、8位HCMOS微控制器)
中文描述: 低成本HCMOS微控制器(低成本,8位HCMOS微控制器)
文件頁數(shù): 22/130頁
文件大?。?/td> 1200K
代理商: MC68HC05P18A
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General Description
Technical Data
MC68HC05P18A
22
General Description
MOTOROLA
1.5.2.2 Ceramic Resonator
In cost-sensitive applications, a ceramic resonator can be used in place
of the crystal. The circuit in
Figure 1-3
(a)
can be used for a ceramic
resonator.
NOTE:
The crystal manufacturer’s recommendations should be followed, as the
crystal parameters determine the external component values required to
provide maximum stability and reliable startup.
The load capacitance values used in the oscillator circuit design should
include all stray capacitances. Mount the resonator and components as
close as possible to the pins for startup stabilization and to minimize
output distortion.
1.5.2.3 External Clock
An external clock from another CMOS-compatible device can be
connected to the OSC1 input, with the OSC2 input not connected, as
shown in
Figure 1-3
(b)
.
1.5.3 Reset (RESET)
Driving this input low resets the MCU to a known startup state. As an
output pin, the RESET pin indicates that an internal MCU reset has
occurred. The RESET pin contains an internal Schmitt trigger to improve
its noise immunity. Refer to
Section 5. Resets
.
1.5.4 Port A (PA0–PA7)
Port A is comprised of eight I/O pins (PA0–PA7). The state of any pin is
software programmable and all port A lines are configured as inputs
during power-on or reset. Eight mask options can be chosen to enable
pullups and interrupts (active low) on port A pins (see
1.4 Mask
Options
). Refer to
Section 7. Input/Output (I/O) Ports
and
Section 4.
Interrupts
.
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