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參數(shù)資料
| 型號： | UPD1724x |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS |
| 中文描述： | 4位單片微控制器的小型通用兩用紅外遙控遞質(zhì) |
| 文件頁數(shù)： | 75/102頁 |
| 文件大?。?/td> | 461K |
| 代理商： | UPD1724X |
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75
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
11. LOW-VOLTAGE DETECTOR (WITH RESET PIN INTERNALLY PULLED DOWN)
The RESET pin is internally pulled down for initialization (reset) to prevent program hang-up that may take place
when the batteries are replaced, if the low-voltage detector detects a low voltage.
A drop in the supply voltage is detected if the status in which V
DD
is about 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 reset function is effected ranges from about 1.7 to 2.0 V, the program counter
is prevented from hanging up even if the supply voltage drops until the reset function is effected. Note that a
resonator may stop oscillating before the reset function is effected if normal operation under the low voltage is not
guaranteed.
The low-voltage detector can be set arbitrarily by a mask option.
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