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參數(shù)資料
| 型號(hào)： | UPD75108F |
| 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)： | 12/78頁 |
| 文件大小： | 549K |
| 代理商： | UPD75108F |
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12
μ
PD75108F,75112F,75116F
3.5
PRECAUTIONS CONCERNING P00/INT4 PIN AND RESET PIN
In addition to the functions shown in 3.1 and 3.2, the P00/INT4 pin and RESET pin are also used to set the test
mode for testing internal
μ
PD75116F operation (for IC testing).
The test mode is set when a voltage greater than V
DD
is applied to either of these pins. Consequently, if noise
exceeding V
DD
is applied during normal operation, the test mode may be entered, making it impossible for normal
operation to continue.
If, for example, inter-wiring noise is applied to the P00/INT4 or RESET pin due to the length of the wiring from
these pins, and the pin voltage exceeds V
DD
, misoperation may result.
Wiring should therefore be carried out so that interwiring noise is suppressed as far as possible. If it is completely
impossible to suppress noise, noise prevention measures should be taken using an external component as shown
below.
G
G
Capacitor connected between
P00/INT4 or RESET and V
DD
G
G
Diode with small V
F
(0.3 V or less) connected
between P00/INT4 or RESET and V
DD
V
DD
V
DD
P00/INT4, RESET
Diode with
small V
F
V
DD
V
DD
P00/INT4, RESET
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