參數(shù)資料
型號(hào)： UPD75402A
廠商： NEC Corp.
英文描述： 4 BIT SINGLE-CHIP MICROCOMPUTER
中文描述： 4位單片機(jī)
文件頁(yè)數(shù)： 11/48頁(yè)
文件大?。?/td> 515K
代理商： UPD75402A
11
μ
PD75402A(A)
3.5 HANDLING UNUSED PINS
Recommended connection method
Connected to the V
SS
pin
When a pull-up resistor is contained
Connected to the V
DD
pin
When a pull-up resistor is not contained
Connected to the V
SS
or V
DD
pin
When a pull-up resistor is contained
Input mode
: Connected to the V
DD
pin
Output mode : Open
When a pull-up resistor is not contained
Input mode
: Connected to the V
SS
or V
DD
pin
Output mode : Open
Open or directly connected to the V
SS
pin
Note
Pin
P00
P01 - P03
P10, P12
P20 - P23
P30 - P33
P50 - P53
P60 - P63
NC
Connect a capacitor between the pin and V
DD
.
Note
When the
μ
PD75402A(A) shares the printed circuit board with the
μ
PD75P402, connect the NC pin
directly to V
SS
pin.
3.6 NOTES ON USING THE P00 AND RESET PINS
The P00 and RESET pins have the test mode selecting function for testing the internal operation of the
μ
PD75402A(A) (IC test), besides the functions shown in
Sections 3.1 and 3.2.
Applying a voltage exceeding V
DD
to the P00 and/or RESET pin causes the
μ
PD75402A(A) to enter the test
mode. When noise exceeding V
DD
comes in during normal operation, the device is switched to the test mode.
For example, when the wiring from the P00 or RESET pin is too long, noise voltage induced on the wiring
is applied to the pin, driving the voltage at the pin above V
DD
, which may cause malfunction.
When installing the wiring, lay the wiring in such a way that noise is suppressed as much as possible. If
noise yet arises, use an external part to suppress it as shown below.
Connect a diode with low V
F
(0.3 V or lower)
between the pin and V
DD
.
V
DD
P00, RESET
V
DD
V
DD
P00, RESET
V
DD
Diode with
low V
F
相關(guān)PDF資料
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