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參數(shù)資料
| 型號(hào)： | UPD17228MC |
| 廠商： | NEC Corp. |
| 元件分類(lèi)： | 4位微控制器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4位單片機(jī)的小型通用紅外遙控器 |
| 文件頁(yè)數(shù)： | 52/84頁(yè) |
| 文件大?。?/td> | 393K |
| 代理商： | UPD17228MC |
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μ
PD17225, 17226, 17227, 17228
52
Data Sheet U12643EJ2V0DS00
10. LOW-VOLTAGE DETECTOR CIRCUIT (CONNECT RESET AND WDOUT PINS)
The low-voltage detector circuit outputs a low level from the WDOUT pin for initialization (reset) to prevent
program hang-up that may take place when the batteries are replaced, if the circuit detects a low voltage.
A drop in the supply voltage is detected if the status of V
DD
= 1.7 to 2.0 V lasts for 1 ms or longer. Note, however,
that 1 ms is the guaranteed value and that the microcontroller may be reset even if the above low-voltage condition
lasts for less than 1 ms.
Although the voltage at which the the reset function is effected ranges from 1.7 to 2.0 V, the program counter
is prevented from hang-up even if the supply voltage drops until the reset function is effected, if the instruction
execution time is from 4 to 32
μ
s. Note that some oscillators stop oscillating before the reset function is effected.
The low-voltage detector circuit can be set arbitrarily by the mask option.
Caution Connect a capacitor to the RESET pin as shown below to stabilize the operation.
Micro-
computer
RESET
WDOUT
Remark
In this figure, the RESET pin is connected to a pull-up resistor by the mask option.
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