Being the key scan device which does

摘要

PPROBLEM TO BE SOLVED: To provide a key scanning device capable of reducing burdens on a CPU connected to the key scanning device, and an electronic device provided with the key scanning device and the CPU. PSOLUTION: A line scanning part 66 performs key scanning and stores the result of scanning in a scanning result storage part 16. The scanning result of the previous time and the scanning result of this time are compared, and change presence/absence information is stored in a scanning result change storage part 18. A scanning permission part 61 permits key scanning performance by the line scanning part 66 on the basis of the permission state of an automatic scanning permission register 62 set from the CPU 70, the standby time of a scanning standby timer register 63, a pressing detection signal of a chattering elimination circuit 15, and the change presence/absence information of the scanning result change storage part 18. PCOPYRIGHT: (C)2011,JPO&INPIT