1.4.1 V
參數(shù)資料
型號: MCHC705KJ1CPE
廠商: Freescale Semiconductor
文件頁數(shù): 17/108頁
文件大?。?/td> 0K
描述: IC MCU 8BIT 64 BYTES RAM 16PDIP
標(biāo)準(zhǔn)包裝: 25
系列: HC05
核心處理器: HC05
芯體尺寸: 8-位
速度: 4MHz
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 10
程序存儲器容量: 1.2KB(1.2K x 8)
程序存儲器類型: OTP
RAM 容量: 64 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 16-DIP(0.300",7.62mm)
包裝: 管件
Introduction
MC68HC705KJ1 MC68HRC705KJ1 MC68HLC705KJ1 Data Sheet, Rev. 4.1
16
Freescale Semiconductor
1.4.1 VDD and VSS
VDD and VSS are the power supply and ground pins. The MCU operates from a single power supply.
Very fast signal transitions occur on the MCU pins, placing high, short-duration current demands on the
power supply. To prevent noise problems, take special care, as Figure 1-3 shows, by placing the bypass
capacitors as close as possible to the MCU. C2 is an optional bulk current bypass capacitor for use in
applications that require the port pins to source high current levels.
Figure 1-3. Bypassing Layout Recommendation
1.4.2 OSC1 and OSC2
The OSC1 and OSC2 pins are the connections for the on-chip oscillator. The oscillator can be driven by
any of the following:
1.
Standard crystal (See Figure 1-4 and Figure 1-5.)
2.
Ceramic resonator (See Figure 1-6 and Figure 1-7.)
3.
Resistor/capacitor (RC) oscillator (Refer to Appendix A MC68HRC705KJ1.)
4.
External clock signal as shown in (See Figure 1-8.)
5.
Low speed (32 kHz) crystal connections (Refer to Appendix B MC68HLC705KJ1.)
The frequency, fOSC, of the oscillator or external clock source is divided by two to produce the internal
operating frequency, fOP.
1.4.2.1 Crystal Oscillator
Figure 1-4 and Figure 1-5 show a typical crystal oscillator circuit for an AT-cut, parallel resonant crystal.
Follow the crystal supplier’s recommendations, as the crystal parameters determine the external
component values required to provide reliable startup and maximum stability. The load capacitance
values used in the oscillator circuit design should include all stray layout capacitances.
To minimize output distortion, mount the crystal and capacitors as close as possible to the pins. An
internal startup resistor of approximately 2 M
is provided between OSC1 and OSC2 for the crystal
oscillator as a programmable mask option.
NOTE
Use an AT-cut crystal and not an AT-strip crystal because the MCU can
overdrive an AT-strip crystal.
C1
C2
MCU
C1
0.1
F
C2
V+
+
VDD
VSS
VDD
VSS
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