AT89C2051 DATASHEET PDF

The clock failed to operate after assembly. I discovered that the MCU had not been flashed with firmware, but actually contained the first 2kb of the assembly source code for the firmware. I purchased 2 more kits from eBay from different sellers hoping to find one with the assembled firmware, but the two new kits also had the same, partial source code flashed on the MCU. I have since been able to obtain the complete, original firmware for this clock kit from one of the eBay sellers. The firmware worked, but had some issues such as when setting time each digit was set separately and each digit could be set to a value of ; it was possible to set a time of

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The clock failed to operate after assembly. I discovered that the MCU had not been flashed with firmware, but actually contained the first 2kb of the assembly source code for the firmware. I purchased 2 more kits from eBay from different sellers hoping to find one with the assembled firmware, but the two new kits also had the same, partial source code flashed on the MCU.

I have since been able to obtain the complete, original firmware for this clock kit from one of the eBay sellers. The firmware worked, but had some issues such as when setting time each digit was set separately and each digit could be set to a value of ; it was possible to set a time of I began this project to create a new firmware that would function in a manner that I desired, including support for a hour format.

A short B2 press will then enter the timer mode. A long B2 press will reset the timer. The timer will continue to increment if running even when cycling through other modes. Timer currently resets after 60 minutes. The hours section will begin to blink. Short B2 presses will increment the hour by 1.

Holding B2 down will cause the clock to increment quickly after 1 second. A short B1 press will then move to the minutes where operation is similar to setting the hour. Another B1 press will exit set time mode and the clock will return to display the current time.

Short B1 presses cycle through setting and enabling the alarm. When viewing the currently set alarm time, the display will blink. This is done to differentiate between viewing the current time and the currently set alarm time. While viewing the alarm time, a long press of B1 will enter the set alarm mode, at which point only the digits being set will blink. Setting the alarm is similar to setting the current time. A short B2 press will toggle this setting.

A short B1 press exist to the display current time mode. While setting the current time or alarm in hour mode, the colon will be off to indicate AM and is on to indicate PM. Kit Modifications The kit includes a 2-pin header marked "3V" which can be used to provide a battery backup for the clock. If you wish to use a battery backup with your kit, there are some modifications you will need to make. Either do not install, or remove resistors R3 and R4. These are 4. Resistor R6, I believe, is being used to trickle-charge a rechargeable backup battery.

The included makefile will compile this code and generate an Intel hex format file named clock. This file may be used to the program the microcontroller. As such you will need to use an external device to program the chip before putting it into circuit.

Instruction on how to do that will vary with the device used to program the chip, so no such instructions are included here.

I use a TL , however there are probably much cheaper options out there. Disclaimers This code is provided as-is, with NO guarantees or liabilities. Use at your own risk.

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