ATMEGA8515-16MU Microcontrollers

Technical Specifications of ATMEGA8515-16MU

Datasheet	ATMEGA8515-16MU datasheet
Category	Integrated Circuits (ICs)
Family	Embedded – Microcontrollers
Manufacturer	Atmel
Series	AVR? ATmega
Packaging	Tray
Part Status	Active
Core Processor	AVR
Core Size	8-Bit
Speed	16MHz
Connectivity	EBI/EMI, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Number of I/O	35
Program Memory Size	8KB (4K x 16)
Program Memory Type	FLASH
EEPROM Size	512 x 8
RAM Size	512 x 8
Voltage – Supply (Vcc/Vdd)	4.5 V ~ 5.5 V
Data Converters	–
Oscillator Type	Internal
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	44-VFQFN Exposed Pad
Supplier Device Package	44-VQFN (7×7)

ATMEGA8515-16MU Description

The AVR improved RISC architecture powers the ATmega8515, a low-power 8-bit CMOS microprocessor. The ATmega8515 delivers throughputs near one MIPS per MHz by executing strong instructions in a single clock cycle, giving system designers more flexibility in balancing power consumption and processing speed.

With its 32 general-purpose working registers and extensive instruction set, the AVR core is ideal for various applications. All 32 registers have a direct connection to the ALU, allowing two separate registers to be accessed in a single instruction that takes only one clock cycle to complete. Throughputs of up to 10 times that of traditional CISC microcontrollers can be achieved with this architecture, making it more code-efficient overall.

Features Description

ATmega8515 Compatibility

The ATmega8515 is identical to the AT90S4414/8515 in every respect. Several new features are included as well. To a large extent, the ATmega8515 can communicate with devices using the AT90S4414/8515 pinout. However, there are a few ways in which the two microcontrollers don’t quite mesh. The S8515C Fuse can be programmed to select an AT90S4414/8515 compatibility mode, allowing for a solution to this issue. Since the ATmega8515 is pin-compatible with the AT90S4414/8515, it can be used to update existing PCBs in place of the AT90S4414/8515. Both gadgets have Fuse parts, but their electrical properties and locations are different.

AVR ATmega8515 Memories

Data Memory and Program Memory are the two primary types of memory in the AVR architecture. The ATmega8515 also has a built-in EEPROM Memory for storing information. There is a constant and steady linearity between all three memory domains.

In-System Reprogrammable Flash Program memory

The ATmega8515 has 8K of reprogrammable flash memory on the chip itself. The Flash is set up in a 4K x 16 layouts to account for the 16- or 32-bit width of all AVR instructions. The Flash Program memory space is divided into a Boot Program area and an Application Program region to protect the installed application.

Flash memory is resistant to failure for at least 10,000 write/erase cycles. The ATmega8515 PC’s huge 12-bit width allows it to access the 4K program memory. You may find a comprehensive explanation of the operation of the Boot Program section and its associated Boot Lock bits for software protection on page 166, under the heading “Boot Loader Support – ReadWhile-Write Self-Programming.” On page 179 of “Memory Programming,” there is a detailed description of serial flash data downloading utilizing the SPI pins. Read up on the LPM – Load Program memory instruction to learn more about where constant tables might be stored in program memory.

Power Management and Sleep Modes

The software can save energy by switching off unused MCU features during sleep modes. Users can tailor the AVR’s power consumption to their specific use case by selecting from various sleep modes. To enter any of the three sleep modes, the SE bit in the MCUCR must be set to logic one, and the SLEEP instruction must be executed. The SM2 bit in the MCUCSR Register, the SM1 bit in the MCUCR Register, and the SM0 bit in the EMCUCR Register decide which sleep mode (Idle, Power-down, or Standby) will be activated by the SLEEP command.

It will wake up if an interrupt is enabled and occurs when the MCU is sleeping. After the initial starting time and four cycles, the MCU pauses to execute the interrupt function before continuing with the SLEEP instruction. The contents of the Register File and the SRAM are preserved when the device wakes up from sleep. If a Reset is performed when the MCU is dormant, it will awaken and resume execution from the Reset Vector.

Power-down Mode

The SLEEP command causes the MCU to go into Power-down mode when the SM2.0 bits are written to 010. Here, the external Oscillator is disabled while the External Interrupts and Watchdog remain active (if enabled). The MCU can be woken from sleep mode by an external reset, watchdog reset, brown-out reset, an external level interrupts on INT0, INT1, or INT2, or an external level interrupt on INT2.

In sleep mode, all clocks are effectively disabled, leaving just asynchronous components active. Be aware that if you use a level-triggered interrupt to rouse the MCU from Power-down mode, you’ll need to keep the level changed for a while. Please see “External Interrupts” on page 77 for further explanation. There is a time lag between the occurrence of the wake-up condition and the actual resumption of normal operation after Power-down mode has been activated. After being stopped, the clock can start over and stabilize this way.

Minimizing Power Consumption

Minimizing the power consumption of an AVR-controlled system is complicated by several factors. When possible, you should put your gadget to sleep, and when doing so, you should make sure that as few of its features are active. Turn off any features that aren’t required. The following modules, in particular, may require extra care in pursuing minimum power usage.

Analog Comparator

Whenever possible, the Analog Comparator should be turned off before entering Idle mode. The Analog Comparator is routinely turned off in the other sleep states. If the Analog Comparator is configured to take input from the Internal Voltage Reference, it must be turned off for any mode involving sleeping. If not, the Internal Voltage Reference will be turned on regardless of the current state of the device’s sleep mode.

Brown-out Detector

The Brown-out Detector module can be disabled if the program’s use case does not require it. If the BODEN Fuse is set to activate the Brown-out Detector, it will constantly be using power, even while in sleep mode. This will have a notably larger effect on total current usage during the deeper sleep modes.

Internal Voltage Reference

The Brown-out Detector and the Analog Comparator will trigger the activation of the Internal Voltage Reference when necessary. As mentioned above, when these modules are turned off, the internal voltage reference is also turned off and no longer draws any power. Before using the output after turning the system back on, the user must wait for the reference to finish starting up. The result can be used immediately if the reference is maintained running in sleep mode.

Watchdog Timer

The Watchdog Timer module should be disabled if the program is not using it. If you turn on the Watchdog Timer, it will remain on even while the computer is in sleep mode, meaning it will always be drawing power. This will have a notably larger effect on total current usage during the deeper sleep modes.

Conclusion

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