參數(shù)資料
型號(hào): 38D5
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機(jī)
文件頁數(shù): 25/141頁
文件大小: 2027K
代理商: 38D5
Rev.3.01
REJ03B0158-0301
Aug 08, 2007
Page 25 of 134
38D5 Group
Termination of unused pins
Termination of common pins
I/O ports:
Select an input port or an output port and follow
each processing method.
In addition, it is recommended that related
registers be overwritten periodically to prevent
malfunctions, etc.
Output ports: Open.
Input ports:
If the input level become unstable, through current
flow to an input circuit, and the power supply
current may increase.
Especially, when expecting low consumption
current (at STP or WIT instruction execution etc.),
pull-up or pull-down input ports to prevent
through current (built-in resistor can be used).
We recommend processing unused pins through a
resistor which can secure I
OH
(
avg
) or I
OL
(
avg
).
Because, when an I/O port or a pin which have an
output function is selected as an input port, it may
operate as an output port by incorrect operation
etc.
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