參數(shù)資料
型號(hào)： M3826AMFA-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP100
封裝： PLASTIC, LQFP-100
文件頁數(shù)： 74/93頁
文件大小： 996K
代理商： M3826AMFA-XXXFP
Rev.2.00
May. 24, 2006
page 76 of 90
REJ03B0028-0200
3826 Group (A version)
3.3.3 Termination of unused pins
(1)
Terminate unused pins
Perform the following wiring at the shortest possible distance (20 mm or less) from microcomputer
pins.
Output ports
Open them.
Input ports
Connect each pin to VCC or VSS through each resistor of 1 k
to 10 k.
A for pins whose potential affects to operation modes such as the INTi pin or others, select the
VCC pin or the VSS pin according to their operation mode.
I/O ports
Set the I/O ports for the input mode and connect each pin to VCC or VSS through each resistor
of 1 k
to 10 k. The port which can select a built-in pull-up resistor can also use the built-
in pull-up resistor.
When using the I/O ports as the output mode, open them at “L” or “H”.
When opening them in the output mode, the input mode of the initial status remains until the
mode of the ports is switched over to the output mode by the program after reset. Thus, the
potential at these pins is undefined and the power source current may increase in the input
mode. With regard to an effects on the system, thoroughly perform system evaluation on the
user side.
Since the direction register setup may be changed because of a program runaway or noise,
set direction registers by program periodically to increase the reliability of program.
(2)
Termination remarks
■ Input ports
Do not open them.
● Reason
The power source current may increase depending on the first-stage circuit.
An effect due to noise may be easily produced as compared with proper termination
shown on the above.
■ I/0 ports setting as input mode
[1] Do not open in the input mode.
● Reason
The power source current may increase depending on the first-stage circuit.
An effect due to noise may be easily produced as compared with proper termination
shown on the above.
[2] I/O ports :
Do not connect to VCC or VSS directly.
● Reason
If the direction register setup changes for the output mode because of a program runaway
or noise, a short circuit may occur.
[3] I/O ports :
Do not connect multiple ports in a lump to VCC or VSS through a resistor.
● Reason
If the direction register setup changes for the output mode because of a program runaway
or noise, a short circuit may occur between ports.
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