參數(shù)資料
型號： MC68HC705X4DWR2
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封裝： PLASTIC, SOIC-28
文件頁數(shù)： 85/168頁
文件大?。?/td> 656K
代理商： MC68HC705X4DWR2
Modes of Operation and Pin Descriptions
Pin descriptions
MC68HC05X4 Rev 1.0
MOTOROLA
Modes of Operation and Pin Descriptions
23
11-modes
Pin descriptions
VDD and VSS
Power is supplied to the microcomputer via these two pins. VDD is the
positive supply and VSS is ground.
It is in the nature of CMOS designs that very fast signal transitions occur
on the MCU pins. These short rise and fall times place very high
short-duration current demands on the power supply. To prevent noise
problems, special care must be taken to provide good power supply
by-passing at the MCU. By-pass capacitors should have good
high-frequency characteristics and be as close to the MCU as possible.
By-passing requirements vary, depending on how heavily the MCU pins
are loaded.
Figure 6. 28-pin SOIC pinout
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
PB7/TCMP
RESET
OSC1
OSC2
MDS/TCAP (VPP)
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
VSS
PB6
PB5
PB4
PB3
PB2
PB1
PB0
VDDH
RX1
RX0
VSS1
TX1
TX0
VDD
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PDF描述
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