Digitization manufacture multifunctional assistance control system

[0022] The present invention will be further described below in conjunction with accompanying drawing:

[0023] 1) U1 unit

[0024] U1 unit includes system clock circuit, reset circuit and CPU chip, which is the core part of the system.

[0025] The system clock circuit utilizes the oscillator circuit inside the chip, connects an external crystal oscillator to XTAL1 and XTAL2 pins, and forms a parallel oscillation circuit with capacitors C01 and C02. In order to make the oscillator have higher frequency stability, a 70pF NPO capacitor is used.

[0026] The reset circuit adopts a power-on and button reset circuit. At the moment of power-on, the RC circuit is charged, and a positive pulse appears at the RESET pin. As long as the RESET pin maintains a high level for more than 10ms, the system can be effectively reset.

[0027] The CPU pin function is divided into user I / O, control bus, data bus and address bus, among which the 16-bit address bus is provided by the P0 port through