JPS5566141A - Programmable counter - Google Patents

Programmable counter

Info

Publication number
JPS5566141A
JPS5566141A JP13953178A JP13953178A JPS5566141A JP S5566141 A JPS5566141 A JP S5566141A JP 13953178 A JP13953178 A JP 13953178A JP 13953178 A JP13953178 A JP 13953178A JP S5566141 A JPS5566141 A JP S5566141A
Authority
JP
Japan
Prior art keywords
circuit
counter
register
supplied
bit shift
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
JP13953178A
Other languages
Japanese (ja)
Inventor
Norihiko Iida
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP13953178A priority Critical patent/JPS5566141A/en
Publication of JPS5566141A publication Critical patent/JPS5566141A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
    • H03K23/64—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two
    • H03K23/66—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a variable counting base, e.g. by presetting or by adding or suppressing pulses
    • H03K23/665—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a variable counting base, e.g. by presetting or by adding or suppressing pulses by presetting

Landscapes

  • Manipulation Of Pulses (AREA)

Abstract

PURPOSE:To prevent the lowering of the maximum active frequency by using the 1-bit shift register to the flip-flop at the first step of the counter to read in the preset of the flip-flop of the first step is the form of the serial signal. CONSTITUTION:Down-counter 1 which is driven by input clock pulse 10 is provided along with detector circuit 2 which detects whether the contents of counter 1 is ''4'' or not. The output of circuit 2 is applied to 1-bit shift registers 3-5 which supply pulse 10, and preset enable signal 11 of register 5 is supplied to counter 1. At the same time, pulse 10 is supplied to the input side of circuit 1 as well as to 1-bit shift registers 6 and 7 of the first step. Furthermore, logic values P1-Pn obtained by coding the division ratio are supplied to FFF2-Fn of circuit 1. Then signal 11 is read into register 7 forming the FF of the first step of counter 1 via NAND circuit NA1, register 6 and NOR circuit NR1 each and in the form of the serial signal. Thus the lowering can be prevented for the maximum active frequency.
JP13953178A 1978-11-13 1978-11-13 Programmable counter Pending JPS5566141A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13953178A JPS5566141A (en) 1978-11-13 1978-11-13 Programmable counter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13953178A JPS5566141A (en) 1978-11-13 1978-11-13 Programmable counter

Publications (1)

Publication Number Publication Date
JPS5566141A true JPS5566141A (en) 1980-05-19

Family

ID=15247440

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13953178A Pending JPS5566141A (en) 1978-11-13 1978-11-13 Programmable counter

Country Status (1)

Country Link
JP (1) JPS5566141A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04117727A (en) * 1990-09-06 1992-04-17 Mitsubishi Electric Corp Counter circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04117727A (en) * 1990-09-06 1992-04-17 Mitsubishi Electric Corp Counter circuit

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