参数资料
型号: MC68HC05BS8FB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PQFP44
封装: PLASTIC, QFP-44
文件页数: 43/128页
文件大小: 9691K
代理商: MC68HC05BS8FB
MC68HC05BS8
PIN DESCRIPTION
2
PIN DESCRIPTION
This section provides a description of the functional pins of the MC68HC05BS8 microcontroller.
2.1
Pin Descriptions
PIN NAME
44-pin QFP
PIN No.
DESCRIPTION
VDD, VSS
38, 39
Power is supplied to the MCU using these pins. VDD is the positive power supply;
VSS is ground.
IRQ/
VPP
34
In the user mode this pin is the external hardware interrupt IRQ. Two choices of
interrupt triggering sensitivity are available through the Option register:
1) negative-edge sensitive triggering, or
2) negative-level sensitive triggering.
In bootstrap mode on the MC68HC705BS8, this is the EPROM programming
voltage input pin.
RESET
35
The active low RESET input is not required for start-up, but can be used to reset
the MCU internal state and provide an orderly software start-up procedure.
OSC1, OSC2
36, 37
These pins provide connections to the
on-chip oscillator. The oscillator can be
driven by an AT-crystal circuit or a
ceramic resonator with a maximum
frequency of 4.4MHz. OSC1 may also
be driven by an external oscillator if an
external crystal/resonator circuit is not
used.
Example showing crystal connections.
PA0-PA7
33-26
These eight I/O lines comprise port A. The state of any pin is software
programmable. All port A lines are congured as input during power-on or external
reset.
2M
36pF
4.2MHz
36pF
OSC1
OSC2
MCU
TPG
19
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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