Patent ID: 6952121
Filing Date: 2005-10-04
Classification: H03K,H03L

Abstract:
1. A circuit for dividing periodic input pulses by a preset integer M, comprising: a dual modulus prescaler arranged to receive periodic input pulses and to count the received input pulses for generating prescaled pulses, wherein one prescaled pulse is generated for every Qth input pulse, wherein Q is a division modulus having a value depending on a value of a modulus control signal, wherein when a prescaled pulse is generated from a selected input pulse, the modulus control signal is ignored at least until the onset of a next input pulse is received; a swallow counter arranged to change the modulus control signal to a different value in response to the prescaler receiving every Mth input pulse, wherein M is a preset integer; and a program counter to generate a reset signal in response to the prescaler receiving the Mth input pulse, and wherein the swallow counter changes the modulus control signal in response to the reset signal.