1.5 V
參數(shù)資料
型號： MC705JJ7CDWE
廠商： Freescale Semiconductor
文件頁數(shù)： 74/164頁
文件大?。?/td> 0K
描述： IC MCU 8BIT 224B RAM 20-SOIC
標(biāo)準(zhǔn)包裝： 38
系列： HC05
核心處理器： HC05
芯體尺寸： 8-位
速度： 2.1MHz
連通性： SIO
外圍設(shè)備： POR，溫度傳感器，WDT
輸入/輸出數(shù)： 14
程序存儲器容量： 6KB（6K x 8）
程序存儲器類型： OTP
RAM 容量： 224 x 8
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 4x12b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 20-SOIC（0.295"，7.50mm 寬）
包裝： 管件
VDD and VSS Pins
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
Freescale Semiconductor
17
1.5 VDD and VSS Pins
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.
1.6 OSC1 and OSC2 Pins
The OSC1 and OSC2 pins are the connections for the external pin oscillator (EPO). The OSC1 and OSC2
pins can accept these sets of components:
A crystal as shown in Figure 1-3 (a)
A ceramic resonator as shown in Figure 1-3 (a)
An external resistor as shown in Figure 1-3 (b)
An external clock signal as shown in Figure 1-3 (c)
The selection of the crystal/ceramic resonator or RC oscillator configuration is done by product part
number selection as described in Chapter 17 Ordering Information.
The frequency, fOSC, of the EPO or external clock source is divided by two to produce the internal
operating frequency, fOP.
Figure 1-3. EPO Oscillator Connections
1.6.1 Crystal Oscillator
The circuit in Figure 1-3 (a) shows a typical oscillator circuit for an AT-cut, parallel resonant crystal. The
crystal manufacturer’s recommendations should be followed, as the crystal parameters determine the
external component values required to provide maximum stability and reliable startup. The load
capacitance values used in the oscillator circuit design should include all stray capacitances. The crystal
and components should be mounted as close as possible to the pins for startup stabilization and to
minimize output distortion. An internal startup resistor of approximately 2 M
can be provided between
OSC1 and OSC2 for the crystal type oscillator by use of the OSCRES bit in the MOR.
MCU
(a) Crystal or
Ceramic Resonator
Connections
OSC1
OSC2
2 M
R
UNCONNECTED
EXTERNAL CLOCK
(b) RC Oscillator
Connections
(c) External Clock
Source Connection
OSC1
OSC2
MCU
OSC1
OSC2
MCU
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC705JJ7CDWE 制造商:Freescale Semiconductor 功能描述:8-Bit Microcontroller IC
MC705JP7CPE 功能描述:8位微控制器 -MCU 8B MCU 224 BYTES RAM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
MC705JP7CPE 制造商:Freescale Semiconductor 功能描述:IC 8BIT MCU 68HC05 2.1MHZ DIP-28
MC705K1CP 制造商:Motorola Inc 功能描述:16 PIN DIP INTEGRATED CIRCUIT
MC705L16CFUE 功能描述:8位微控制器 -MCU 8B MCU W/ EPROM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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