參數資料
型號： UPD75104A
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCOMPUTER
中文描述： 4位單片機
文件頁數： 13/66頁
文件大小： 460K
代理商： UPD75104A
μ
PD75104A, 75108A
13
3.5
NOTES ON USING THE P00/INT4, AND RESET PINS
In addition to the functions described in Sections 3.1 and 3.2, an exclusive function for setting the test mode,
in which the internal fuctions of the
μ
PD75108A are tested (solely used for IC tests), is provided to the P00/
INT4 and
RESET
pins.
If a voltage exceeding V
DD
is applied to either of these pins, the
μ
PD75108A is put into test mode. Therefore,
even when the
μ
PD75108A is in normal operation, if noise exceeding the V
DD
is input into any of these pins,
the
μ
PD75108A will enter the test mode, and this will cause problems for normal operation.
As an example, if the wiring to the P00/INT4 pin or the
RESET
pin is long, stray noise may be picked up
to these pins and the above montioned problem may occur.
Therefore, all wiring to these pins must be made short enough to not pick up stray noise. If noise cannot
be avoided, suppress the noise using a capacitor or diode as shown in the figure below.
Connect a capacitor across P00/INT4 and
RESET
, and V
DD
.
Connect a diode across P00/INT4 and
RESET
, and V
DD
.
V
DD
V
DD
P00/INT4, RESET
V
DD
V
DD
P00/INT4, RESET
相關PDF資料
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