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參數資料
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: 20/130頁
文件大小: 1200K
代理商: MC68HC05P18A
L
G
R
General Description
Technical Data
MC68HC05P18A
20
General Description
MOTOROLA
Figure 1-2. User Mode Pinout
1.5.1 Power Supply (V
DD
and V
SS
)
Power is supplied to the MCU through V
DD
and V
SS
. V
DD
is connected
to a regulated +5-volt supply and V
SS
is connected to ground.
Very fast signal transitions occur on the MCU pins. The short rise and
fall times place very 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. Use bypass capacitors with good
high-frequency characteristics and position them as close to the MCU as
possible. Bypassing requirements vary, depending on how heavily the
MCU pins are loaded.
1.5.2 Oscillator Pins (OSC1 and OSC2)
The OSC1 and OSC2 pins are the control connections for the on-chip
oscillator. The OSC1 and OSC2 pins can accept:
1.
A crystal or ceramic resonator, as shown in
Figure 1-3
(a)
2.
An external clock signal, as shown in
Figure 1-3
(b)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
RESET
IRQ
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
SDO/PB5
SDI/PB6
SCK/PB7
V
SS
V
DD
OSC1
OSC2
PD7/TCAP
TCMP
PD5/CKOUT
PC0
PC1
PC2
PC3/AD3
PC4/AD2
PC5/AD1
PC6/AD0
PC7/V
REFH
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