HR7P171 Datasheet | Eastsoft

HR7P171 Datasheet 8-bit MCU HR7P171  Brief  Datasheet  Specifications SHANGHAI EASTSOFT MICROELECTRONICS CO., LTD. 2017.12.08 Preliminary Copyright © Shanghai Eastsoft Microelectronics Co., Ltd. 1/127 http://.essemi. HR7P171 Datasheet Application Notes Power On/Off Sequence Eastsoft MCUs are designed with separate power pins. If a MCU is applied in a system which has multiple power supplies, the MCU should be powered on first or at the same time together with other devices involved in the system. Conversely, the MCU should be powered off after all other devices are powered off. Reversed steps may cause excessive voltage or current on the MCU internal ponents, which is very likely to cause malfunction and weaken ponents performances. For details, please refer to the datasheet. Reset Eastsoft MCUs provide an internal power-on reset circuit, which could possibly be invalid in different fast/slow power on/off systems. To ensure a proper reset function, the following resets are remended: external reset, brown-out reset, watchdog reset, etc. The triode reset or the RC reset is remended when the external reset circuit is used; otherwise, it is suggested to connect the reset pin to power supply with a resistor or to use other protection circuits if necessary. For details, please refer to the datasheet. Clock Eastsoft MCUs offer internal and external clock sources. The internal clock frequency may experience a variation due to unstable temperature or voltage, which may affect the accuracy of the clock source. When a ceramic or crystal oscillator circuit is used as an external clock source, it is suggested to enable the oscillator start-up timer. When a RC oscillator circuit is used, it is suggested to take account of the capacitor matching and resistor matching. When an external active oscillator or external clock input is used, consider to input a high-voltage or low-voltage. For details, please refer to the datasheet Initialization For different...