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參數(shù)資料
| 型號： | UPD7566A |
| 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(shù)： | 8/58頁 |
| 文件大小： | 471K |
| 代理商： | UPD7566A |
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μ
PD7566A, 7566A(A)
8
1.4 NOTES ON USING THE P00/INT0, AND RESET PINS
In addition to the functions described in 1.1, 1.2, and 1.3, an exclusive function for setting the test mode, in which
the internal functions of the
μ
PD7566A are tested, is provided to the P00/INT0 and RESET pins.
If a voltage less than V
SS
is applied to either of these pins, the
μ
PD7566A is put into test mode. Therefore, even
when the
μ
PD7566A is in normal operation, if noise less than the V
SS
is input into any of these pins, the
μ
PD7566A
will enter the test mode, and this will cause problems for normal operation.
As an example, if the wiring to the P00/INT0 pin or the RESET pin is long, stray noise may be picked up and the
above mentioned 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 diode having a low V
F
across
P00/INT0 and RESET, and V
SS
.
Connect a capacitor across P00/INT0 and RESET,
and V
SS
.
V
DD
P00/INT0, RESET
V
DD
V
SS
Low V
F
diode
V
DD
P00/INT0, RESET
V
DD
V
SS
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