The hex files can be formed by keil, which can be burned to a single chip. The control of the keypad forms the number of the code table, storing, rereading, and clearing.

Filename	Size	Update
div码表	8984	2017-10-17
div码表.LST	8290	2017-10-17
div码表.M51	13706	2017-10-17
div码表.OBJ	9847	2017-10-17
div码表.__i	37	2017-10-17
div码表.c	2638	2017-10-17
div码表.hex	1638	2017-10-17
div码表.lnp	47	2017-10-17
div码表.plg	164	2017-11-16
div码表.uvopt	56266	2017-11-16
div码表.uvproj	13411	2017-10-16
div码表_uvopt.bak	56262	2017-11-16
div码表_uvproj.bak

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