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參數(shù)資料
| 型號： | UPD75106GF |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| 中文描述： | 4位單片機(jī) |
| 文件頁數(shù)： | 13/70頁 |
| 文件大?。?/td> | 535K |
| 代理商： | UPD75106GF |
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μ
PD75104, 75106, 75108
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
PD75108 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
PD75108 is put into test mode. Therefore,
even when the
μ
PD75108 is in normal operation, if noise exceeding the V
DD
is input into any of these pins, the
μ
PD75108 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
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
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