Description: 1602 lcd display driver with key monitoring and control port rs = P0 ^ 7 rw = P3 ^ 3 sbit ep = 0xc4 data interface P2 24M clock display range is 0 ~ 9 A ~ Z a ~ z:-/< > . A total of 16 keys P1 keys keys from 1 to 16 returned 0 for no type
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io_driver.h
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