发明名称 |
MEASUREMENT METHOD FOR RING OSCILLATOR CLOCK FREQUENCY, MEASUREMENT CIRCUIT FOR RING OSCILLATOR CLOCK FREQUENCY, AND MICROCOMPUTER |
摘要 |
<p>PROBLEM TO BE SOLVED: To reduce current consumption by measuring a frequency of a ring oscillator clock with high accuracy, then by operating a microcomputer by only the ring oscillator clock. SOLUTION: An Xin clock count timer 2 starts to count an Xin clock by a start command from a CPU 5. When a counted number reaches a set value, the Xin clock count timer 2 outputs an overflow signal. A ring oscillator clock count timer 4 counts a ring oscillator clock from the generation of the start command in the CPU 5 to the generation of the overflow signal in the Xin clock count timer 2. A frequency of the ring oscillator clock is gotten from a count number counted in the interval.</p> |
申请公布号 |
JP2001013179(A) |
申请公布日期 |
2001.01.19 |
申请号 |
JP19990184279 |
申请日期 |
1999.06.29 |
申请人 |
MITSUBISHI ELECTRIC CORP;MITSUBISHI DENKI SYSTEM LSI DESIGN KK |
发明人 |
MORIMOTO YASUSHI;FUJII TAKASHI |
分类号 |
G06F1/04;G01R23/02;G01R23/10;G01R23/15;H03K3/03;H03K5/19;(IPC1-7):G01R23/10 |
主分类号 |
G06F1/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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