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: 17/158页
文件大小: 1106K
代理商: MC68HC05P9AP
Pin Descriptions
Pin Functions
MOTOROLA
Pin Descriptions
17
NOTE:
Because the frequency stability of ceramic resonators is not as high as
that of crystal oscillators, using a ceramic resonator may degrade the
performance of the ADC.
RC Oscillator
The lowest cost oscillator is the
RC oscillator configuration
where a resistor is connected
between the two oscillator pins
as shown in
Figure 6
. The
internal startup resistor of
approximately 2 M
is not
recommended between OSC1
and OSC2 for the RC-type
oscillator.
External C lock
C onnections
An external clock from another
CMOS-compatible device can
drive the OSC1 input, with the
OSC2 pin unconnected, as
Figure 7
shows.
RESET
A logic 0 on the RESET pin
forces the MCU to a known
startup state. The RESET pin
input circuit contains an internal
Schmitt trigger to improve noise
immunity.
IRQ
The IRQ pin has the following functions:
Applying asynchronous external interrupt signals
Applying V
TST
, the mode detection voltage
R
OSC1
OSC2
MCU
Figure 6. RC Oscillator
Connections
MCU
O
O
EXTERNAL
CMOS CLOCK
UNCONNECTED
Figure 7. External Clock
Connections
9-mc68hc05p9a
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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