Clock switching circuit, integrated circuit device and electronic apparatus
AssigneeSeiko Epson Corporation
InventorKeisuke HASHIMOTO
Life of this patent
Estimating the term…
Abstract
A clock switching circuit includes: a selector that selects one of a plurality of clocks based on a select signal and outputs the clock selected as a selected clock; a mask circuit that masks the selected clock based on a mask signal and outputs the selected clock masked as an output clock; and a mask signal generation circuit that generates the mask signal and the select signal, the mask signal generation circuit switches a signal level of the select signal after causing the mask signal to be active, and causes the mask signal to be inactive on condition that a change is detected in the signal level of the selected clock after the signal level of the select signal has been switched.
Claims9
A clock switching circuit comprising:
- a selector that selects one of a plurality of clocks based on a select signal and outputs the clock selected as a selected clock;
- a mask circuit that masks the selected clock based on a mask signal and outputs the selected clock masked as an output clock;
- and
- a mask signal generation circuit that generates the mask signal and the select signal,
- the mask signal generation circuit switching a signal level of the select signal after causing the mask signal to be active, and causes the mask signal to be inactive on condition that a change is detected in the signal level of the selected clock after the signal level of the select signal has been switched.
Dependencies are inferred from the claim text.