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Specifications
SKU: 11249070
| 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 | 2.7 V to 6.0 V |
| Operating Frequency | Maximum Clock Frequency | 24 MHz |
| Flash Memory | Program Memory Size | 20 KB (16K x 14) |
| EEPROM | Data Memory Size | 512 Bytes |
| RAM | Internal RAM Size | 1.25 KB (1280 x 8) |
| I/O Ports | Number of I/O Lines | 32 |
| Timers/Counters | Number of Timers/Counters | 3 (16-bit) |
| Serial Communication Interface (SCI) | UART Support | 1 |
| Serial Peripheral Interface (SPI) | SPI Support | 1 |
| Watchdog Timer (WDT) | Watchdog Timer | Yes |
| Power Consumption | Active Mode (fosc = 24 MHz, Vcc = 5.5 V) | 15 mA |
| Power Consumption | Idle Mode (fosc = 24 MHz, Vcc = 5.5 V) | 0.1 μA |
| Operating Temperature Range | Industrial Grade | -40°C to +85°C |
| Programming Method | Programming Interface | ISP (In-System Programming) |
| Program Erase Time | Typical Erase Time | 1 second |
| Program Write Time | Typical Write Time | 1 ms per 128 bytes |
Instructions for Using AT89C55WD-24PU
Power Supply:
- Connect the Vcc pin (pin 40) to the positive supply voltage (2.7 V to 6.0 V).
- Connect the GND pin (pin 20) to the ground.
Clock Configuration:
- Use an external crystal oscillator or ceramic resonator between XTAL1 (pin 19) and XTAL2 (pin 18) for clock generation.
- For a 24 MHz operation, use a 24 MHz crystal.
Reset Circuit:
- Connect a reset circuit to the RST pin (pin 9). A typical reset circuit includes a capacitor and a resistor to provide a reset pulse during power-up and manual resets.
Programming:
- Use an ISP programmer to program the flash memory. The programming interface uses the following pins:
- MISO (Master In Slave Out)
- MOSI (Master Out Slave In)
- SCK (Serial Clock)
- RST (Reset)
- Use an ISP programmer to program the flash memory. The programming interface uses the following pins:
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 control registers (P0, P1, P2, P3).
Interrupts:
- Enable and configure interrupts using the Interrupt Enable (IE) register and the Interrupt Priority (IP) register.
Timers/Counters:
- Initialize the timers/counters by setting the mode and initial values in the Timer Control (TCON) and Timer Mode (TMOD) registers.
- Use the Timer Interrupt Enable bits in the IE register to enable timer interrupts.
Serial Communication:
- Configure the UART for serial communication by setting the baud rate and other parameters in the Serial Control (SCON) register.
- Use the Serial Data (RXD and TXD) pins for data transmission and reception.
Watchdog Timer:
- Enable the watchdog timer by setting the appropriate bit in the Special Function Register (SFR).
- Periodically reset the watchdog timer to prevent a system reset.
Power Management:
- Use the idle mode to reduce power consumption when the microcontroller is not actively processing data.
- Enter idle mode by setting the appropriate bit in the Power Control (PCON) register.
Debugging:
- Use the on-chip debugging features, if available, to monitor and control the microcontroller during development.
Storage and Handling:
- Store the microcontroller in a static-protective bag to prevent damage from electrostatic discharge (ESD).
- Handle the microcontroller with care to avoid bending or damaging the pins.
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