| 摘要 |
PROBLEM TO BE SOLVED: To allow actual measurement of a worst value of spec of a microcomputer including a CPU and a peripheral unit which asynchronously operate. SOLUTION: The peripheral unit 150 outputs a retrial request signal RT1 for requesting resending of data until processing corresponding to access from the CPU 102 is completed. An FF 116 outputs a strobe request signal SR when latching a second retrial request signal RT2 in timing of a strobe signal ST1. A bus control circuit 112 and a strobe signal generation circuit 114 perform sending of the data and the strobe signal ST1 when receiving the strobe request signal SR from the FF 116 to perform the resending. A retrial frequency control part 120 stops output of the second retrial request signal RT2 to the flip-flop 116 when the resending at the final time out of the preset prescribed number of times is decided. COPYRIGHT: (C)2011,JPO&INPIT
|
