參數(shù)資料
型號(hào)： HC805P18GRS
英文描述： 68HC805P18 Technical Data
中文描述： 68HC805P18技術(shù)數(shù)據(jù)
文件頁(yè)數(shù)： 15/111頁(yè)
文件大?。?/td> 748K
代理商： HC805P18GRS
GENERAL RELEASE SPECIFICATION
MOTOROLA
1-6
INTRODUCTION
MC68HC805P18
Rev. 1.0
8
2
3
4
5
6
7
8
9
10
11
12
13
14
A
16
17
18
19
20
Figure 1-3. Oscillator Connections
1.4.4 Reset (RESET)
Driving this input low will reset the MCU to a known startup state. As an output,
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
.
1.4.5 Port A (PA0 through PA7)
These eight I/O pins comprise port A. The state of any pin is software
programmable and all port A lines are configured as inputs during power-on or
reset. The pullups and interrupt options (active low) on the port A pins can be
individually programmed in the mask option register 2 (MOR2). For further
information, refer to
SECTION 4 INTERRUPTS
and
SECTION 7 INPUT/OUTPUT
PORTS
.
TO V
DD
(OR STOP)
TO V
DD
(OR STOP)
(
a)
Crystal or Ceramic
Resonator Connections
(b)
External Clock Source
Connections
OSC1
OSC2
MCU
37 pF
37 pF
4.7 M
MCU
OSC1
OSC2
UNCONNECTED
EXTERNAL CLOCK
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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