The design uses P1 port output high

The design uses P1 port output high and low battery combinations in different states to control the opening and closing of the oil circuit to achieve the purpose of boosting, holding and decompressing. The P1 port of 80C196KC is used as a quasi-bidirectional input and output port. It consists of a buffer internal port latch, an internal register and an output buffer and an output buffer, as well as an output buffer and an output buffer. Resistance structure When the port data changes from 0 to 1, it can produce a stronger pull-up effect in a short time, thereby speeding up the transition process: when output, it has a latch effect, that is, it remains unchanged before rewriting. Data to the port.