Abstract:
Memory space of a digital device may be configured for both instructions/data (op- code) and ECC or parity when required, otherwise the entire memory space may be configured for just the program instructions/data. A standard word width memory may be configured for ECC or non-ECC functionality, or parity or non-parity functionality, based upon a desired application. The last portion of the memory may be allocated for ECC or parity data rather then application code when an ECC or parity implementation is required. When an ECC or parity implementation is not required, the entire memory may be used for the application code. This allows a digital device and memory to be used in applications having different robustness (e.g., application code integrity) requirements without have to fabricate different digital devices.
Abstract:
A semiconductor integrated circuit device upon exiting from a low power mode, wakes up and re-initializes logic circuits so as to restore previous logic states of internal registers without disturbing input-output (I/O) configuration control and data states present at the time the low power mode was entered. Thus not distributing the operation of other devices connected to the semiconductor integrated circuit device previously in the low power mode. Once all internal logic and registers of the semiconductor integrated circuit device have been re-initialized, a "low power state wake-up and restore" signal may issue. This signal indicates that the I/O configuration control and data states stored in the I/O keeper cell at the time the integrated circuit device entered into the low power mode have been reinstated and control may be returned to the logic circuits and/or internal registers of the semiconductor integrated circuit device.
Abstract:
A microcontroller may have at least a first and second output port coupled with external first and second pins, respectively, a programmable switching arrangement operable in a first mode to provide for a first and second output signal at the first and second pins, respectively, and in a second mode to provide for a first output signal at the first pin and an inverted first output signal at the second pin.
Abstract:
A mixed signal device having an analog-to-digital converter (ADC) with offset and gain calibration using internal voltage references whereby the digital processor calibrates out offset and gain errors in the analog-to-digital converter by adjusting the analog input amplifier gain and offset or with software compensating the digital representations of the voltages measured. Two different known voltage values are used in determining the offset and gain adjustments needed to calibrate the ADC against the two know voltage values. The mixed signal device may further comprise a Bandgap voltage reference having an accurate known voltage value. Wherein the Bandgap voltage reference may be used for further offset and gain calibration of the ADC to produce substantially absolute voltage values.
Abstract:
Peripheral functions of an integrated circuit device may be pooled and dynamically mapped to available external input-output connections of the integrated circuit device by using a set of configuration registers. To provide system robustness, the configuration registers may implement various levels of write protection, error correction and monitoring circuitry. One or more peripheral output functions may be mapped to one or more external output connections. Not more than one output function may be active at the same time on the same output connection. Outputs and inputs may be mapped to the same external input- output connection with or without the output being controllable for placement into an inactive state, e.g., high impedance or open collector. When the input is required to receive external data over the external input-output connection, the output may be placed into the inactive state.
Abstract:
A digital device having selectable modes for USB communications buffer management in a USB interface of the digital device. These modes may comprise (1) no ping-pong buffer support, (2) ping-pong buffer support for some endpoints, e.g., support for OUT endpoint 0 only, and (3) ping-pong buffer support for all endpoints. In the no pingpong buffer support mode, no hardware is required for automatic ping-pong buffer management. The Buffer Descriptor Tables may comprise a maximum of 128 memory locations, e.g., 16 IN endpoints and 16 OUT endpoints, each with at least one buffer descriptor, and each comprising four (4) memory locations. In the ping-pong buffer support for OUT endpoint 0 only mode, the buffer descriptor Tables may comprise a maximum of 132 memory locations, e.g., 16 OUT endpoints with an EVEN and an ODD endpoint 0, 16 IN endpoints, each with at least one descriptor, e.g., memory locations. This mode assures that endpoint 0 setup transfers may be serviced without delay while only requiring a minimal number of memory locations for the remainder of the buffer descriptors. In the ping-pong buffer support for all endpoints mode, automatic ping-pong buffer management may be provided for all endpoints. The Buffer Descriptor Tables may comprise a maximum of 256 memory locations, e.g., 16 IN endpoints and 16 OUT endpoints, an EVEN and ODD set for each, each with one descriptor, e.g., four (4) memory locations. This mode assures that all endpoint transfers may be serviced substantially without delay.
Abstract:
A method, system and apparatus are provided for alternating instruction sets in central processing units. A microcontroller is provided with a configuration mechanism, such as a fuse that, depending upon the setting, determines which of multiple instruction sets (or multiple parts of a single instruction set) can be processed by the central processing unit. By changing the fuse setting the characteristics of the central processing unit, and thus the microcontroller as a whole, can be changed.
Abstract:
A microcontroller has a central processing unit (CPU), a plurality of peripherals, and a programmable scheduler unit with: - a timer being clocked by an independent clock signal; - a comparator coupled with a timer register of said timer and having an output generating an output signal; - an event register coupled with said comparator; - a delta time register; and - an arithmetic logic unit controlled by the output signal of the comparator and with first and second inputs and an output, wherein the first input is coupled with the timer register or the event register and the second input is coupled with the delta time register and the output is coupled with the event register.
Abstract:
A semiconductor integrated circuit device upon exiting from a low power mode, wakes up and re-initializes logic circuits so as to restore previous logic states of internal registers without disturbing input-output (I/O) configuration control and data states present at the time the low power mode was entered. Thus not distributing the operation of other devices connected to the semiconductor integrated circuit device previously in the low power mode. Once all internal logic and registers of the semiconductor integrated circuit device have been re-initialized, a "low power state wake-up and restore" signal may issue. This signal indicates that the I/O configuration control and data states stored in the I/O keeper cell at the time the integrated circuit device entered into the low power mode have been reinstated and control may be returned to the logic circuits and/or internal registers of the semiconductor integrated circuit device.
Abstract:
A special mode key match comparison module has N-storage elements and a special mode key match comparator. The N-storage elements accumulate a serial data stream, and then determine whether a digital device should operate in a normal user mode, in a public programming mode, or in a particular private test mode. To reduce the possibility of accidentally decoding a false test or programming mode, the data stream has a sufficiently large number of N-bits to substantially reduce the probability of a false decode. To further reduce the possibility of accidentally decoding a programming or test mode, the special mode key match comparison module may be reset if less or more than N-clocks are detected during the accumulation of the N-bit serial data stream. The special mode key match data patterns may represent a normal user mode, a public programming mode, and particular private manufacturer test modes.