除此以为，AT89C51单片机还设有稳态逻辑，这样就能够在零频率非常低

In addition to this, the AT89C51 microcontroller is also equipped with steady-state logic, so that static logic can be performed under very low zero frequency conditions, and supports two software-selectable power-down modes. When the microcontroller is in an idle state, the CPU will be in a sleep state and will not work. But other parts of the system will not stop working, such as RAM, timers, counters, serial ports and interrupt systems have been working. In the case of a sudden power failure, the microcontroller will automatically save the stored contents of the RAM and freeze the oscillator, prohibit the use of other chip functions, and wait until the next hardware reset.

In addition, the AT89C51 microcontroller also has a steady-state logic, which allows static logic to be performed at very low zero frequencies, supporting two software-selectable power-down modes. When the microcontroller is idle, the CPU is dormant and does not work. But other parts of the system do not stop working, such as RAM, timers, counters, serial ports and interrupt systems are working all the time. In the case of sudden power loss, the single chance automatically saves the storage content of RAM while freezing the oscillator, prohibits the use of other chip functions, and waits until the next hardware reset sits.

In addition to this, AT89C51 single chip also has a steady-state logic, so that it can carry out static logic under the condition of very low zero frequency, and support two kinds of software optional power-off mode. When the MCU is idle, the CPU will be in the sleep state and will not work. But other parts of the system will not stop working, such as RAM, timer, counter, serial port and interrupt system has been working. In case of sudden power failure, the single-chip microcomputer will automatically save the ram stored content and freeze the oscillator, forbid other chip functions, and wait until the next hardware reset to stop.