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Title: 4乘4键盘扫描控制器 Download
 Description: 1. The key value is encoded in hexadecimal, i.e. 16 keys display hexadecimal numbers respectively 0 ~ F, the corresponding relationship of keys is as follows: the top line is 0 ~ 3 from left to right, The second row is 4-7 from left to right, and the third row is 8-b from left to right From left to right, the following line is C-F, where B and D are lower case, and other words Capital letter; 2. When the key is pressed, the current key value will be displayed and maintained until the next key is pressed Display; 3. Only when the key is pressed, the buzzer will emit a key tone, and when it is released, the buzzer will not emit a sound. 4. Each key corresponds to a different key tone.
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File list (Check if you may need any files): 
FilenameSizeDate
Week15-Quartus II_6 0  2020-06-05

Week15-Quartus II_6\beepflag 0  2020-06-06

Week15-Quartus II_6\beepflag\beepflag.asm.rpt 8867  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.done 26  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.fit.rpt 154659  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.fit.smsg 499  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.fit.summary 599  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.flow.rpt 7397  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.map.rpt 18633  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.map.summary 458  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.pin 58186  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.pof 2097308  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.qpf 1276  2020-06-04

Week15-Quartus II_6\beepflag\beepflag.qsf 2712  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.qws 1171  2020-06-06

Week15-Quartus II_6\beepflag\beepflag.sim.rpt 11094  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.sof 525344  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.tan.rpt 15565  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.tan.summary 1021  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.vhd 640  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.vhd.bak 642  2020-06-05

Week15-Quartus II_6\beepflag\beepflag.vwf 5209  2020-06-05

Week15-Quartus II_6\beepflag\db 0  2020-06-06

Week15-Quartus II_6\beepflag\db\beepflag.(0).cnf.cdb 1312  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.(0).cnf.hdb 909  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.asm.qmsg 2226  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.asm_labs.ddb 5663  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.cbx.xml 90  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.cmp.bpm 539  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.cmp.cdb 3073  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.cmp.ecobp 28  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.cmp.hdb 6882  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.cmp.kpt 339  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.cmp.logdb 10095  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.cmp.rdb 21950  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.cmp.tdb 2139  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.cmp0.ddb 94542  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.cmp_merge.kpt 345  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.db_info 151  2020-06-04

Week15-Quartus II_6\beepflag\db\beepflag.eco.cdb 175  2020-06-06

Week15-Quartus II_6\beepflag\db\beepflag.eds_overflow 5  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.fit.qmsg 24902  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.hier_info 264  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.hif 768  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.lpc.html 430  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.lpc.rdb 399  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.lpc.txt 1060  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.map.bpm 526  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.map.cdb 1363  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.map.ecobp 28  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.map.hdb 6679  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.map.kpt 2107  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.map.logdb 4  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.map.qmsg 3834  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.map_bb.cdb 635  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.map_bb.hdb 5965  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.map_bb.logdb 4  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.pre_map.cdb 1421  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.pre_map.hdb 6970  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.rtlv.hdb 6969  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.rtlv_sg.cdb 1334  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.rtlv_sg_swap.cdb 192  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.sgdiff.cdb 1044  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.sgdiff.hdb 6969  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.sim.cvwf 1149  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.sim.hdb 3315  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.sim.qmsg 4023  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.sim.rdb 2560  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.sld_design_entry.sci 168  2020-06-06

Week15-Quartus II_6\beepflag\db\beepflag.sld_design_entry_dsc.sci 168  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.syn_hier_info 0  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.tan.qmsg 24768  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.tis_db_list.ddb 188  2020-06-05

Week15-Quartus II_6\beepflag\db\beepflag.tmw_info 304  2020-06-06

Week15-Quartus II_6\beepflag\db\prev_cmp_beepflag.asm.qmsg 2226  2020-06-05

Week15-Quartus II_6\beepflag\db\prev_cmp_beepflag.fit.qmsg 24902  2020-06-05

Week15-Quartus II_6\beepflag\db\prev_cmp_beepflag.map.qmsg 3834  2020-06-05

Week15-Quartus II_6\beepflag\db\prev_cmp_beepflag.qmsg 4023  2020-06-05

Week15-Quartus II_6\beepflag\db\prev_cmp_beepflag.sim.qmsg 4023  2020-06-05

Week15-Quartus II_6\beepflag\db\prev_cmp_beepflag.tan.qmsg 24768  2020-06-05

Week15-Quartus II_6\beepflag\db\wed.wsf 3826  2020-06-06

Week15-Quartus II_6\beepflag\incremental_db 0  2020-06-04

Week15-Quartus II_6\beepflag\incremental_db\compiled_partitions 0  2020-06-05

Week15-Quartus II_6\beepflag\incremental_db\compiled_partitions\beepflag.root_partition.cmp.atm 4878  2020-06-05

Week15-Quartus II_6\beepflag\incremental_db\compiled_partitions\beepflag.root_partition.cmp.dfp 33  2020-06-05

Week15-Quartus II_6\beepflag\incremental_db\compiled_partitions\beepflag.root_partition.cmp.hdbx 1644  2020-06-05

Week15-Quartus II_6\beepflag\incremental_db\compiled_partitions\beepflag.root_partition.cmp.kpt 341  2020-06-05

Week15-Quartus II_6\beepflag\incremental_db\compiled_partitions\beepflag.root_partition.cmp.logdb 74  2020-06-05

Week15-Quartus II_6\beepflag\incremental_db\compiled_partitions\beepflag.root_partition.cmp.rcf 842  2020-06-05

Week15-Quartus II_6\beepflag\incremental_db\compiled_partitions\beepflag.root_partition.map.atm 3421  2020-06-05

Week15-Quartus II_6\beepflag\incremental_db\compiled_partitions\beepflag.root_partition.map.dpi 818  2020-06-05

Week15-Quartus II_6\beepflag\incremental_db\compiled_partitions\beepflag.root_partition.map.hdbx 1590  2020-06-05

Week15-Quartus II_6\beepflag\incremental_db\compiled_partitions\beepflag.root_partition.map.kpt 2110  2020-06-05

Week15-Quartus II_6\beepflag\incremental_db\README 653  2020-06-04

Week15-Quartus II_6\beepfrq 0  2020-06-05

Week15-Quartus II_6\beepfrq\beepfrq.asm.rpt 8806  2020-06-05

Week15-Quartus II_6\beepfrq\beepfrq.done 26  2020-06-05

Week15-Quartus II_6\beepfrq\beepfrq.fit.rpt 168060  2020-06-05

Week15-Quartus II_6\beepfrq\beepfrq.fit.smsg 499  2020-06-05

Week15-Quartus II_6\beepfrq\beepfrq.fit.summary 597  2020-06-05

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