參數(shù)資料
型號(hào): MC68HC05P18MDW
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁(yè)數(shù): 59/144頁(yè)
文件大?。?/td> 1348K
代理商: MC68HC05P18MDW
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General Description
Functional Pin Description
MC68HC(8)05P18 — Rev. 2.0
Advance Information
MOTOROLA
General Description
21
Figure 1-2. User Mode Pinout
1.5.1 V
DD and VSS
Power is supplied to the MCU through V
DD and VSS.VDD is connected
to a regulated positive 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 OSC1 and OSC2
The OSC1 and OSC2 pins are the control connections for the on-chip
oscillator. The OSC1 and OSC2 pins can accept:
A crystal as shown in Figure 1-3(a)
A ceramic resonator as shown in Figure 1-3(a)
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
VSS
VDD
OSC1
OSC2
PD7/TCAP
TCMP
PD5/CKOUT
PC0
PC1
PC2
PC3/AD3
PC4/AD2
PC5/AD1
PC6/AD0
PC7/VREFH
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