参数资料
型号: MC68HC705JB2P
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP20
封装: PLASTIC, DIP-20
文件页数: 37/128页
文件大小: 2493K
代理商: MC68HC705JB2P
GENERAL RELEASE SPECIFICATION
August 28, 1998
GENERAL DESCRIPTION
MC68HC705JB2
1-4
REV 1.1
Figure 1-2. Pin Assignments for 20-Pin Package
1.4
FUNCTIONAL PIN DESCRIPTIONS
The following paragraphs give a description of the general function of each pin
assigned in Figure 1-2.
1.4.1 VDD, VSS
Power is supplied to the MCU through VDD and VSS. VDD is the positive supply,
and VSS is ground. The MCU operates from a single power supply.
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, special care should be taken to provide good power supply
bypassing at the MCU by using bypass capacitors with good high-frequency
characteristics that are positioned as close to the MCU as possible. Bypassing
requirements vary, depending on how heavily the MCU pins are loaded.
1.4.2 OSC1, OSC2
The OSC1 and OSC2 pins are the connections for the on-chip oscillator. The
OSC1 and OSC2 pins can accept the following sets of components:
RESET
1
PA0
2
PA1
3
PA2
4
PA3
5
PA4
6
PB0/TCAP
7
PB1
8
VDD
20
OSC1
19
OSC2
18
VSS
17
3.3V
16
D+
15
D–
14
PA7
13
PA6
12
PA5
11
IRQ/VPP
10
PB2
9
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For More Information On This Product,
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相关PDF资料
PDF描述
MC68HC705JB4P 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP28
MC68HC705K1CDW 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDSO16
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MC68HC705K1DW 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDSO16
相关代理商/技术参数
参数描述
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