JPS647215A - Clock switching circuit - Google Patents

Clock switching circuit

Info

Publication number
JPS647215A
JPS647215A JP62163138A JP16313887A JPS647215A JP S647215 A JPS647215 A JP S647215A JP 62163138 A JP62163138 A JP 62163138A JP 16313887 A JP16313887 A JP 16313887A JP S647215 A JPS647215 A JP S647215A
Authority
JP
Japan
Prior art keywords
ffs
switching circuit
clock switching
outputs
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP62163138A
Other languages
Japanese (ja)
Inventor
Kimiharu Yaegashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP62163138A priority Critical patent/JPS647215A/en
Publication of JPS647215A publication Critical patent/JPS647215A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To reduce the number of components while any clock signal of a frequency can be stably switched by crossing the input and output of two D-FFs and preventing both outputs from being active simultaneously. CONSTITUTION:The input and output of D-FFs 11 and 12 are crossed. For this reason, the outputs of the D-FFs 11 and 12 do not go to an HI level simultaneously. Consequently, even when the frequency of clock signals C1 and C2 is in any relation, an always stable signal is outputted from an OR gate 19 and a succeeding circuit does not execute a malfunction. Since only two D-FFs are used, the number of parts is minimized.
JP62163138A 1987-06-30 1987-06-30 Clock switching circuit Pending JPS647215A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62163138A JPS647215A (en) 1987-06-30 1987-06-30 Clock switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62163138A JPS647215A (en) 1987-06-30 1987-06-30 Clock switching circuit

Publications (1)

Publication Number Publication Date
JPS647215A true JPS647215A (en) 1989-01-11

Family

ID=15767928

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62163138A Pending JPS647215A (en) 1987-06-30 1987-06-30 Clock switching circuit

Country Status (1)

Country Link
JP (1) JPS647215A (en)

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