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Specifications
SKU: 12608291
| Parameter | Description | Value |
|---|---|---|
| Part Number | Full Part Number | AT89C55WD-24PU |
| Package Type | Package Style | PDIP (Plastic Dual In-Line Package) |
| Pin Count | Number of Pins | 40 |
| Operating Voltage (Vcc) | Supply Voltage Range | 2.7V to 6.0V |
| Operating Frequency | Maximum Clock Frequency | 24 MHz |
| Flash Memory | Flash Program Memory Size | 20 KB |
| EEPROM | EEPROM Data Memory Size | 1 KB |
| RAM | Internal RAM Size | 1.25 KB |
| I/O Ports | Number of I/O Lines | 32 |
| Timers/Counters | Number of Timers/Counters | 3 |
| Interrupt Sources | Number of Interrupt Sources | 14 |
| Watchdog Timer | Watchdog Timer Availability | Yes |
| Power Consumption | Active Mode Current | 2 mA (typical) at 5V, 24 MHz |
| Power Consumption | Idle Mode Current | 0.1 μA (typical) at 5V, 24 MHz |
| Operating Temperature Range | Industrial Grade | -40°C to +85°C |
| Programming Method | In-System Programming (ISP) | Yes |
| Programming Voltage | ISP Programming Voltage | 2.7V to 6.0V |
| Programming Time | Typical Programming Time | 1 ms per 128 bytes |
| Erase Method | Chip Erase Time | 1 second (typical) |
| Endurance | Write/Erase Cycles | 10,000 cycles (minimum) |
| Data Retention | Data Retention Time | 10 years (minimum) |
Instructions for Using AT89C55WD-24PU
Power Supply:
- Connect Vcc (pin 40) to the positive supply voltage (2.7V to 6.0V).
- Connect GND (pin 20) to the ground.
Clock Configuration:
- Connect an external crystal oscillator between pins 18 (XTAL1) and 19 (XTAL2) for clock generation.
- Alternatively, use an external clock source connected to XTAL1.
Reset Circuit:
- Connect a reset circuit to pin 9 (RST). The reset pin should be pulled high to reset the microcontroller.
- A typical reset circuit includes a resistor and a capacitor to ground.
Programming:
- Use an ISP programmer to program the flash memory.
- Ensure the programming voltage is within the specified range (2.7V to 6.0V).
I/O Configuration:
- Configure the I/O ports using the internal pull-up resistors or external pull-up/pull-down resistors as needed.
- Set the direction of the I/O pins using the corresponding port registers (P0, P1, P2, P3).
Timers/Counters:
- Initialize the timers/counters by setting the appropriate registers (TMOD, TCON).
- Use the timer interrupts for periodic tasks.
Interrupts:
- Enable the desired interrupts by setting the corresponding bits in the IE register.
- Write interrupt service routines (ISRs) to handle the interrupts.
Watchdog Timer:
- Enable the watchdog timer by setting the WDT control bit.
- Reset the watchdog timer periodically to prevent a system reset.
Power Management:
- Use the idle mode to reduce power consumption when the microcontroller is not performing active tasks.
- Enter idle mode by setting the appropriate bit in the PCON register.
Debugging:
- Use an in-circuit debugger to test and debug the microcontroller.
- Ensure the debugger is compatible with the ISP interface.
For detailed information and specific applications, refer to the datasheet and application notes provided by the manufacturer.
(For reference only)Inquiry - AT89C55WD-24U
