參數(shù)資料
型號： GMS87C7216LQ
廠商： Electronic Theatre Controls, Inc.
元件分類： 數(shù)學(xué)處理器
英文描述： 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 8位單晶片微控制器
文件頁數(shù)： 83/121頁
文件大小： 1645K
代理商： GMS87C7216LQ
GMS81C7208/7216
FEB. 2005 Ver 1.04
79
It should be set properly that current flow through port doesn't ex-
ist.
First consider the setting to input mode. Be sure that there is no
current flow after considering its relationship with external cir-
cuit. In input mode, the pin impedance viewing from external
MCU is very high that the current doesn’t flow.
But input voltage level should be V
SS
or V
DD
. Be careful that if
unspecified voltage, i.e. if un-firmed voltage level (not V
SS
or
V
DD
) is applied to input pin, there can be little current (max. 1mA
at around 2V) flow.
If it is not appropriate to set as an input mode, then set to output
mode considering there is no current flow. Setting to High or Low
is decided considering its relationship with external circuit. For
example, if there is external pull-up resistor then it is set to output
mode, i.e. to High, and if there is external pull-down register, it is
set to low.
Figure 20-6 Application Example of Unused Input Port
Figure 20-7 Application Example of Unused Output Port
INPUT PIN
V
DD
GND
i
V
DD
X
Weak pull-up current flows
V
DD
internal
pull-up
INPUT PIN
i
V
DD
X
Very weak current flows
V
DD
O
O
OPEN
OPEN
i=0
O
i=0
O
GND
When port is configure as an input, input level should
be closed to 0V or 5V to avoid power consumption.
OUTPUT PIN
GND
i
In the left case, much current flows from port to GND.
X
ON
OFF
OUTPUT PIN
GND
i
In the left case, Tr. base current flows from port to GND.
To avoid power consumption, there should be low output
to the port .
i=0
X
OFF
ON
V
DD
L
ON
OFF
OPEN
GND
V
DD
L
ON
OFF
ON
OFF
O
O
V
DD
O
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