參數(shù)資料
型號： MC68HC705JB2DW
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDSO20
封裝： SOIC-20
文件頁數(shù)： 40/128頁
文件大?。?/td> 2493K
代理商： MC68HC705JB2DW
August 28, 1998
GENERAL RELEASE SPECIFICATION
GENERAL DESCRIPTION
REV 1.1
1-7
1.4.5 PA0-PA7
These eight I/O lines comprise PortA. PA0 to PA7 are push-pull pins with pulldown
devices. PA4 to PA7 are also capable of sinking 8 mA.
The state of any pin is software programmable and all Port A lines are congured
as inputs during power-on or reset. The lower four I/O pins (PA0 thru PA3) can be
connected via an internal OR gate to the IRQ interrupt function enabled by a mask
option. See Section 7 on Input/Output Ports for further details.
1.4.6 PB0-PB2
These three I/O lines comprise Port B. PB1 and PB2 are open-drain I/O lines with
pullup devices, whereas PB0 (shared with TCAP), is a push-pull I/O line with
pulldown device.
The state of any pin is software programmable and is congured as an input
during power-on or reset. PB1 and PB2 are also slow transition outputs, each
capable of sinking 25mA typical current at 0.5V VOL Max. See Section 7 on
Input/Output Ports for further details.
1.4.7 D+, D–
D+ and D– are the differential data lines used by the USB module. See
Section 10 on Universal Serial Bus Module.
1.4.8 3.3V
This is the 3.3V output of the on-chip voltage regulator from the MCU. It is used to
supply the voltage for the external pullup resistor required by the USB on D–. This
regulator output is also used internally for the USB data driver circuitry. This 3.3V
pin should be decoupled using a 1
F (or greater) capacitor and a 0.1F bypass
capacitor.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)PDF資料
PDF描述
MC68HC705JB2P 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP20
MC68HC705JB4P 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP28
MC68HC705K1CDW 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDSO16
MC68HC705K1CP 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDIP16
MC68HC705K1S 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, CDIP16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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