参数资料
型号: MC68HC05P9AP
厂商: 飞思卡尔半导体(中国)有限公司
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件页数: 15/158页
文件大小: 1106K
代理商: MC68HC05P9AP
Pin Descriptions
Pin Functions
MOTOROLA
Pin Descriptions
15
Pin Functions
V
DD
and V
SS
V
DD
and V
SS
are the power supply and ground pins. The MCU operates
from a single 5-V power supply.
Very fast signal transitions occur
on the MCU pins, placing high
short-duration current demands
on the power supply. To prevent
noise problems, take special
care to provide good power
supply bypassing at the MCU as
Figure 3
shows. Place the
bypass capacitors as close as
possible to the MCU. C2 is an
optional bulk current bypass
capacitor for use in applications
that require the port pins to
source high current levels.
OSC1 and OSC2
The OSC1 and OSC2 pins are the connections for the on-chip oscillator.
The oscillator can be driven by any of the following:
Crystal
Ceramic resonator
RC Oscillator
External clock signal
The frequency of the on-chip oscillator is f
OSC
. The MCU divides the
internal oscillator output by two to produce the internal clock with a
frequency of f
OP
.
MCU
V
D
V
S
C1
0.1
μ
F
C2
+
V
DD
Figure 3. Bypassing
Recommendation
7-mc68hc05p9a
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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