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US 11,296,653 B2Granted
Microcontroller comprising oscillators that are configured to receive external resonator signals
AssigneeSTMicroelectronics (Rousset) SAS
InventorsArnaud Gamet, Philippe Le Fevre
Life of this patent
Estimating the term…
Abstract
A shared pair of input/output cells configured to be able to be connected to a first external resonator or a second external resonator. A first oscillator and a second oscillator are coupled to the shared pair input/output cells by a switching circuit. The switching circuit is configured to be able to connect either the first oscillator or the second oscillator to the pair of input/output cells.
Claims25
A microcontroller, comprising:
- a plurality of pairs of input/output cells;
- wherein said plurality includes at least one shared pair of input/output cells;
- a first oscillator;
- a second oscillator;
- a switching circuit coupled between said at least one shared pair of input/output cells and the first and second oscillators, wherein the switching circuit is configured to be able to connect either the first oscillator or the second oscillator to the shared pair of input/output cells;
- wherein said shared pair of input/output cells comprises a first pair of pins configured to be connected to a first external resonator in connection with the switching circuit connecting the second oscillator to the first external resonator through the first pair of pins of the shared pair of input/output cells;
- and
- wherein said shared pair of input/output cells comprises a second pair of pins configured to be connected to a second external resonator in connection with the switching circuit connecting the second oscillator to the second external resonator through the second pair of pins of the shared pair of input/output cells.
5 more elements
A microcontroller, comprising:
- a plurality of pairs of input/output cells;
- wherein said plurality includes at least one shared pair of input/output cells;
- a first oscillator;
- a second oscillator;
- a switching circuit coupled between said at least one shared pair of input/output cells and the first and second oscillators, wherein the switching circuit is configured to be able to connect either the first oscillator or the second oscillator to the shared pair of input/output cells;
- wherein said shared pair of input/output cells is configured to be able to be connected to a first external resonator in connection with the switching circuit connecting the second oscillator to the shared pair of input/output cells;
- wherein said shared pair of input/output cells is configured to be able to be connected to a second external resonator in connection with the switching circuit connecting the second oscillator to the shared pair of input/output cells;
- and
- wherein said at least one shared pair of input/output cells comprises:
- a first cell used as output to the first resonator and the second resonator;
- and
- a second cell used as input for the first resonator and the second resonator.
9 more elements
A microcontroller, comprising:
- an output cell including a first pin for external connection;
- an input cell including a second pin for external connection;
- a first oscillator;
- a second oscillator;
- a switching circuit coupled between the first and second oscillators and the first and second pins of the input cell and the output cell;
- wherein said switching circuit is configured to, in a first switched configuration, selectively connect the first oscillator to the input cell and output cell through the first and second pins and, in a second switched configuration, selectively connect the second oscillator to the input cell and output cell through the first and second pins;
- wherein the first pin of the input cell and the second pin of the output cell are configured to support connection to an external resonator.
4 more elements
A microcontroller, comprising:
- an output cell;
- an input cell;
- a first oscillator;
- a second oscillator;
- a switching circuit coupled between the first and second oscillators and the input cell and the output cell;
- wherein said switching circuit is configured to, in a first switched configuration, selectively connect the first oscillator to the input cell and output cell and, in a second switched configuration, selectively connect the second oscillator to the input cell and output cell;
- wherein the input cell and output cell are configured to support connection to an external resonator;
- and
- wherein the output cell includes a first output node and a second output node, and wherein the switching circuit comprises:
- a first switched path between an output of the first oscillator and the first output node;
- a second switched path between the output of the first oscillator and the second output node;
- and
- a feedback path between the second output node and a feedback input of the first oscillator.
10 more elements
A microcontroller, comprising:
- an output cell;
- an input cell;
- a first oscillator;
- a second oscillator;
- a switching circuit coupled between the first and second oscillators and the input cell and the output cell;
- wherein said switching circuit is configured to, in a first switched configuration, selectively connect the first oscillator to the input cell and output cell and, in a second switched configuration, selectively connect the second oscillator to the input cell and output cell;
- wherein the input cell and output cell are configured to support connection to an external resonator;
- and
- wherein the input cell includes a first input node and a second input node, and wherein the switching circuit comprises:
- a first switched path between an input of the first oscillator and the first input node;
- a second switched path between the input of the first oscillator and the second input node;
- and
- a feedback path between the second input node and a feedback input of the first oscillator.
10 more elements
A microcontroller, comprising:
- an output cell;
- an input cell;
- a first oscillator;
- a second oscillator;
- a switching circuit coupled between the first and second oscillators and the input cell and the output cell;
- wherein said switching circuit is configured to, in a first switched configuration, selectively connect the first oscillator to the input cell and output cell and, in a second switched configuration, selectively connect the second oscillator to the input cell and output cell;
- wherein the input cell and output cell are configured to support connection to an external resonator;
- and
- wherein the output cell includes a first output node and a second output node, and wherein the switching circuit comprises:
- a first switched path between an output of the second oscillator and the second output node;
- a second switched path between the output of the second oscillator and the first output node;
- and
- a feedback path between the first output node and a feedback input of the second oscillator.
10 more elements
Dependencies are inferred from the claim text.