Microcomputer having an integrated RC oscillator with programmab

Details Microcomputer having an integrated RC oscillator with programmab Microcomputer having an integrated RC oscillator with programmab

1990-11-21

1992-01-28

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 36C, 331108C, 331111, 331143, 331179, H03L 7181, H03K 3295

Patent

active

050846850

ABSTRACT:
A monolithically integrated microcomputer clocked at a processor clock rate includes a clock generator in the form of an RC oscillator being synchronizable by external signals for controlling at least one functional unit operating asynchronously with the processor clock rate. The RC oscillator has a frequency-determining resistor and a frequency-determining capacitor being monolithically integrated. The frequency-determining capacitor is formed of a plurality of switchable capacitors to be interconnected to make a total capacitor with a variable size. Registers are each connected to a respective one of the capacitors for defining a switching state of the switchable capacitors. A central processing unit is connected to the registers for adjusting the frequency of the clock generator by setting the registers.

REFERENCES:
patent: 3895315 (1975-07-01), Way
patent: 4652837 (1987-03-01), D'Arrigo et al.
patent: 4667168 (1987-05-01), Shiomi et al.
patent: 4723114 (1988-02-01), D'Arrigo et al.
patent: 4814640 (1989-05-01), Miyake
patent: 4816776 (1989-05-01), Kessler
patent: 4868525 (1989-09-01), Dias
Philips Laboratory Report of the Central Application Laboratory CAB, Number DPE87221 of Nov. 16, 1987; J. C. P. M. Pijnenburg "PCF84C640 Spec. Version 1.0".
Mitsubishi Microcomputers M50433B-XXXSP by Mitsubishi Electric.
U. Tietze et al: "Semiconductor Circuit Technology", 8th Printing, 1986, p. 177, FIG. 8.31.

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