Timer control with selectable frequency divider

Details Timer control with selectable frequency divider Timer control with selectable frequency divider

1990-03-27

1991-10-29

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Particular input circuit

377 2, 377 16, 377 56, 377 20, 204DIG11, G06M 302, G06M 306

Patent

active

050621289

ABSTRACT:
A semiconductor integrated circuit constructed on a single chip. Either one of a signal inputted to a clock signal input terminal and a signal obtained by dividing the frequency of the clock signal inputted to the clock signal input terminal is selected by a selecting circuit responsive to a selection signal supplied from the exterior of the chip to be supplied to a control circuit. Consequently, the frequency dividing circuit can be bypassed in response to the selecting circuit. Accordingly, it is possible to easily provide operation at a high frequency exceeding the maximum operating frequency of component devices forming the semiconductor integrated circuit. This can be done by connecting an external circuit having the same function as that of the circuit bypassed and capable of higher-speed operation.

REFERENCES:
patent: 3878370 (1975-04-01), Santomango et al.
patent: 4066875 (1978-01-01), Ollington et al.
patent: 4079315 (1978-03-01), Mohr
patent: 4251999 (1981-02-01), Tanaka

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