参数资料
型号: MC68HC805P18MP
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, EEPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封装: PLASTIC, DIP-28
文件页数: 59/144页
文件大小: 1292K
代理商: MC68HC805P18MP
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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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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