Details

---

BUY AT89C55WD-24U https://www.utsource.net/itm/p/12608291.html

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 渭A (typical) at 5V, 24 MHz
Operating Temperature Range	Industrial Grade	-40掳C to +85掳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

1. Power Supply:

   • Connect Vcc (pin 40) to the positive supply voltage (2.7V to 6.0V).
   • Connect GND (pin 20) to the ground.

2. 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.

3. 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.

4. Programming:

   • Use an ISP programmer to program the flash memory.
   • Ensure the programming voltage is within the specified range (2.7V to 6.0V).

5. 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).

6. Timers/Counters:

   • Initialize the timers/counters by setting the appropriate registers (TMOD, TCON).
   • Use the timer interrupts for periodic tasks.

7. Interrupts:

   • Enable the desired interrupts by setting the corresponding bits in the IE register.
   • Write interrupt service routines (ISRs) to handle the interrupts.

8. Watchdog Timer:

   • Enable the watchdog timer by setting the WDT control bit.
   • Reset the watchdog timer periodically to prevent a system reset.

9. 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.

10. 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)