ATMEGA128L – 8MU
Microcontroller Core
The ATMEGA128L – 8MU is based on an 8 – bit AVR microcontroller core. It has a rich and diverse instruction set, incorporating arithmetic, logical, data transfer, and control instructions. This equips it to handle a wide array of computational and control tasks, affording developers the flexibility to create software for various application scenarios.
It operates at a maximum clock frequency of 8 MHz. This clock speed dictates how quickly it processes instructions and conducts internal operations, ensuring proper interaction with external components and timely execution of tasks.
Memory Configuration
Flash Memory: It features an internal Flash memory for program storage. With a capacity of 128 KB, it provides ample space for developers to store their application code. This non – volatile memory retains the stored instructions even when the power is turned off, making it highly suitable for applications where code preservation is crucial.
Data Memory: The internal data memory consists of 4 KB of SRAM (Static Random – Access Memory) and 4 KB of EEPROM (Electrically Erasable Programmable Read – Only Memory). The SRAM is used for temporary data storage during program execution, such as holding variables and intermediate calculation results. The EEPROM is invaluable for storing data that needs to be retained even after power cycles, like configuration parameters, calibration values, or user – defined constants.
Input/Output Ports
The microcontroller is equipped with four 8 – bit input/output (I/O) ports, namely Port A, Port B, Port C, and Port D. These ports together offer 32 I/O pins that can be configured as either input or output, depending on the specific requirements of the application.
Port A: Some pins of Port A possess analog input capabilities, enabling the microcontroller to interface with analog sensors and convert the analog signals into digital values for further processing. This allows it to connect with temperature sensors, light sensors, and other analog devices to gather real – world data.
Port B: Certain pins of Port B can generate interrupts when their state changes. This feature enhances the microcontroller’s responsiveness to external events, enabling it to quickly detect and respond to changes like a button press or a sensor state alteration.
Ports C and D: These ports have their own unique functions and can be used to interface with a wide range of external devices, such as switches, LEDs, relays, or other microcontrollers. The pins can be set to receive signals from external components or send control signals to them, facilitating seamless integration into various electronic systems.
Interrupt System
It has a built – in interrupt system with multiple interrupt sources. These include external interrupts triggered by external pins and internal interrupts generated by events such as timer overflows, comparator outputs, or serial communication events. When an interrupt occurs, the microcontroller can immediately suspend its current operation and jump to a specific interrupt service routine to handle the event.
The interrupt system assigns priorities to different interrupt sources. This ensures that more critical events are dealt with first, maintaining the orderly operation of the system and enabling efficient multitasking in response to various external stimuli. For example, a critical sensor reading might take precedence over a less urgent background task.
Timer/Counter Units
The ATMEGA128L – 8MU incorporates two 8 – bit timer/counter units and two 16 – bit timer/counter units. These can be utilized for a variety of purposes.
They can generate precise time delays. In applications like a timed access control system, the timer/counter units can be used to set the duration for which a door remains unlocked.
They can measure the time interval between external events. In an event – counting application, such as tallying the number of pulses from a sensor, the timer/counting units can accurately record the time between consecutive pulses.
They can also create pulse – width modulated (PWM) signals. In applications like motor speed control or dimming of lights, the PWM signals generated by these units can adjust the speed of a motor or the brightness of a light source. The timer/counter units can be configured in different modes, each offering distinct features and capabilities, such as operating in timer mode (counting internal clock cycles) or counter mode (counting external events based on the input signals received at specific pins).
Analog – to – Digital Converter (ADC)
It features a 10 – bit ADC. The ADC allows the microcontroller to convert analog input signals from sensors (such as temperature sensors, light sensors, etc.) into digital values. This conversion is essential for processing and analyzing the analog information in a digital domain. The ADC has a specific number of input channels and can be configured with different reference voltages and sampling rates according to the requirements of the application. For example, in a temperature – monitoring application, the ADC can convert the analog voltage output of a temperature sensor into a digital value that represents the temperature.
Serial Communication
The ATMEGA128L – 8MU supports serial communication through its USART (Universal Serial Asynchronous Receiver/Transmitter) module. This enables it to communicate with other devices that support serial communication protocols, such as PCs, other 微控制器，or external peripherals. The USART can operate at different baud rates, which can be configured according to the 要求 of the communication partners.
Serial communication allows for the transfer of data bit – by – bit in a sequential manner. It can be used for sending commands, receiving sensor data, or sharing information among different components in a system. For example, in a remote – sensing application, the microcontroller can use serial communication to send the measured data to a central monitoring station.
Power Management
The microcontroller has power management features that allow it to operate efficiently under different power supply conditions. It can enter different power – saving modes when appropriate. For example, it can reduce its clock frequency or turn off specific peripherals to conserve energy when the device is in an idle state or when only a few low – power functions are required.
It can operate within a specific range of power supply voltages, which provides flexibility in choosing the power source and integrating the microcontroller into various power – supplied systems.
Microcontroller Core
The ATMEGA128L – 8MU is based on an 8 – bit AVR microcontroller core. It has a rich and diverse instruction set, incorporating arithmetic, logical, data transfer, and control instructions. This equips it to handle a wide array of computational and control tasks, affording developers the flexibility to create software for various application scenarios.
It operates at a maximum clock frequency of 8 MHz. This clock speed dictates how quickly it processes instructions and conducts internal operations, ensuring proper interaction with external components and timely execution of tasks.
Memory Configuration
Flash Memory: It features an internal Flash memory for program storage. With a capacity of 128 KB, it provides ample space for developers to store their application code. This non – volatile memory retains the stored instructions even when the power is turned off, making it highly suitable for applications where code preservation is crucial.
Data Memory: The internal data memory consists of 4 KB of SRAM (Static Random – Access Memory) and 4 KB of EEPROM (Electrically Erasable Programmable Read – Only Memory). The SRAM is used for temporary data storage during program execution, such as holding variables and intermediate calculation results. The EEPROM is invaluable for storing data that needs to be retained even after power cycles, like configuration parameters, calibration values, or user – defined constants.
Input/Output Ports
The microcontroller is equipped with four 8 – bit input/output (I/O) ports, namely Port A, Port B, Port C, and Port D. These ports together offer 32 I/O pins that can be configured as either input or output, depending on the specific requirements of the application.
Port A: Some pins of Port A possess analog input capabilities, enabling the microcontroller to interface with analog sensors and convert the analog signals into digital values for further processing. This allows it to connect with temperature sensors, light sensors, and other analog devices to gather real – world data.
Port B: Certain pins of Port B can generate interrupts when their state changes. This feature enhances the microcontroller’s responsiveness to external events, enabling it to quickly detect and respond to changes like a button press or a sensor state alteration.
Ports C and D: These ports have their own unique functions and can be used to interface with a wide range of external devices, such as switches, LEDs, relays, or other microcontrollers. The pins can be set to receive signals from external components or send control signals to them, facilitating seamless integration into various electronic systems.
Interrupt System
It has a built – in interrupt system with multiple interrupt sources. These include external interrupts triggered by external pins and internal interrupts generated by events such as timer overflows, comparator outputs, or serial communication events. When an interrupt occurs, the microcontroller can immediately suspend its current operation and jump to a specific interrupt service routine to handle the event.
The interrupt system assigns priorities to different interrupt sources. This ensures that more critical events are dealt with first, maintaining the orderly operation of the system and enabling efficient multitasking in response to various external stimuli. For example, a critical sensor reading might take precedence over a less urgent background task.
Timer/Counter Units
The ATMEGA128L – 8MU incorporates two 8 – bit timer/counter units and two 16 – bit timer/counter units. These can be utilized for a variety of purposes.
They can generate precise time delays. In applications like a timed access control system, the timer/counter units can be used to set the duration for which a door remains unlocked.
They can measure the time interval between external events. In an event – counting application, such as tallying the number of pulses from a sensor, the timer/counting units can accurately record the time between consecutive pulses.
They can also create pulse – width modulated (PWM) signals. In applications like motor speed control or dimming of lights, the PWM signals generated by these units can adjust the speed of a motor or the brightness of a light source. The timer/counter units can be configured in different modes, each offering distinct features and capabilities, such as operating in timer mode (counting internal clock cycles) or counter mode (counting external events based on the input signals received at specific pins).
Analog – to – Digital Converter (ADC)
It features a 10 – bit ADC. The ADC allows the microcontroller to convert analog input signals from sensors (such as temperature sensors, light sensors, etc.) into digital values. This conversion is essential for processing and analyzing the analog information in a digital domain. The ADC has a specific number of input channels and can be configured with different reference voltages and sampling rates according to the requirements of the application. For example, in a temperature – monitoring application, the ADC can convert the analog voltage output of a temperature sensor into a digital value that represents the temperature.
Serial Communication
The ATMEGA128L – 8MU supports serial communication through its USART (Universal Serial Asynchronous Receiver/Transmitter) module. This enables it to communicate with other devices that support serial communication protocols, such as PCs, other 微控制器，or external peripherals. The USART can operate at different baud rates, which can be configured according to the 要求 of the communication partners.
Serial communication allows for the transfer of data bit – by – bit in a sequential manner. It can be used for sending commands, receiving sensor data, or sharing information among different components in a system. For example, in a remote – sensing application, the microcontroller can use serial communication to send the measured data to a central monitoring station.
Power Management
The microcontroller has power management features that allow it to operate efficiently under different power supply conditions. It can enter different power – saving modes when appropriate. For example, it can reduce its clock frequency or turn off specific peripherals to conserve energy when the device is in an idle state or when only a few low – power functions are required.
It can operate within a specific range of power supply voltages, which provides flexibility in choosing the power source and integrating the microcontroller into various power – supplied systems.
