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minimum requirements for running it on internal clock and burn the data with jta...
ziondido

ziondido

@copilot minimum requirements for running it on internal clock and burn the data with jtag
2y

copilot

To run the ATMEGA8A-AU on its internal clock and program it using JTAG, follow the steps below:
  1. Set the Fuse Bits: Firstly, set the fuse bits to run the microcontroller on its internal clock. The ATmega8A has 3 bytes of fuse bits: High, Low, and Extended. To use the internal 8MHz clock, set the CKSEL fuse bits (CKSEL3..1) to 0100 (4 in decimal and 2 in hexadecimal). You should check the datasheet to ensure you set these correctly.
    For using JTAG, ensure that the JTAGEN fuse bit is programmed.
    Here's how the fuse settings should look:
    • Low fuse byte (Fuse Low Byte - FLB): The CKSEL bits should be set to 0100 i.e., 0xE4 if you want to divide the clock by 8, else 0xE2.
    • High fuse byte (Fuse High Byte - FHB): To enable JTAG, make sure the JTAGEN bit is unprogrammed i.e., 0xD9.
    Confirm the Fuse settings with the datasheet or use an online fuse calculator available for ATmega8.
  2. Wire the JTAG Interface: This would typically involve connecting the JTAG pins of your programmer to the JTAG pins of the ATmega8 (TCK, TMS, TDI, and TDO). Here's how you should connect them:
    • TCK (Test Clock input) - Connect to pin PD6 of ATMEGA8A-AU (Pin 9).
    • TMS (Test Mode Select input) - Connect to pin PD7 of ATMEGA8A-AU (Pin 10).
    • TDI (Test Data In input) - Connect to pin PB5 of ATMEGA8A-AU (Pin 16).
    • TDO (Test Data Out output) - Connect to pin PB6 of ATMEGA8A-AU (Pin 6).
  3. Provide Power and Ground: Connect the VCC and GND pins on your programmer to VCC and GND on the ATmega8A-AU. VCC (Pin 3 and 5) and GND (Pin 2 and 4).
  4. Burn the Data: You should now be able to use your JTAG programmer's software to burn the data into the microcontroller.
Remember that PD4 (Pin 1) is the JTAGEN pull-up pin, and it should be connected via a resistor to VCC.
Please refer to the ATmega8A datasheet for in-depth information on these matters and bear in mind that mishandling of Fuse bits can render your MCU non-responsive. Use an online fuse calculator for ATmega8 to double-check your settings.
2y
ziondido

ziondido

so what to connect and where to connect it
2y

copilot

To connect the ATMEGA8A-AU for programming with a JTAG interface, you would need to connect the following pins:
  1. Power pins: Connect VCC and GND pins on your JTAG programmer to VCC and GND on the ATmega8A-AU.
    • Connect the JTAG programmer's VCC to VCC on ATMEGA8A-AU, which are pins 3 and 5.
    • Connect the JTAG programmer's GND to GND on ATMEGA8A-AU, which are pins 2 and 4.
  2. JTAG pins: Connect the following pins:
    • Connect TCK (Test Clock input) on the JTAG programmer to pin PD6 of ATMEGA8A-AU, which is pin 9.
    • Connect TMS (Test Mode Select input) on the JTAG programmer to pin PD7 of ATMEGA8A-AU, which is pin 10.
    • Connect TDI (Test Data In input) on the JTAG programmer to pin PB5 of ATMEGA8A-AU, which is pin 16.
    • Connect TDO (Test Data Out output) on the JTAG programmer to pin PB6 of ATMEGA8A-AU, which is pin 6.
Please be aware that you need to match these pins on your specific JTAG programmer, as they can be labeled differently depending on the manufacturer.
Remember to enable the internal clock via the fuse settings for the ATMEGA8A-AU and ensure your JTAG interface is enabled as well before attempting to program the microcontroller.
2y
2
recommend a replacement for U1.
ziondido

ziondido

@copilot recommend a replacement for U1.
2y

copilot

Replacing the ATmega8A-AU microcontroller should be based on the requirements of your project, such as the computing power, pin count, and power consumption. If you're looking for a similar microcontroller with more features, here are two options:
  1. ATmega328P-AU: This is the microcontroller used in the popular Arduino Uno board. It has the same pin configuration as the ATmega8A but with twice the flash memory (32 KB), SRAM (2 KB), and EEPROM (1 KB). It's a perfect choice if you're planning to extend the features of your project.
    Properties: Pins: 32 Manufacturer: Microchip Core Processor: AVR Core Size: 8-bit Connectivity: I²C, SPI, USART Number of I/O: 23 Program Memory Size: 32KB (16K x 16) Flash Size: 32KB
  2. ATmega16A-AU: This chip is a step up from the ATmega8A. It has all the features of the ATmega8A with twice the flash memory (16 KB), SRAM (1 KB), and EEPROM (512 B).
    Properties: Pins: 44 Manufacturer: Microchip Core Processor: AVR Core Size: 8-bit Connectivity: I²C, SPI, USART Number of I/O: 32 Program Memory Size: 16KB (8K x 16) Flash Size: 16KB
Remember to validate that your firmware will be compatible with the new microcontroller, especially, if there are specific peripherals or features that your current firmware uses. Also, ensure that replaced microcontroller can accommodate the input and output requirements of your design.
2y
1
U1
Not Recommended for New Designs
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Metropolitan Silver Antigravity Battle Room

Metropolitan Silver Antigravity Battle Room thumbnail
Welcome to your new project. Imagine what you can build here.

Properties

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Distributor

Qty 1

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$5.08

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$2.98

Mouser

$5.08

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