Details

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BUY P87C52SFBB https://www.utsource.net/itm/p/12607696.html

Parameter	Description	Value
Device Type	Microcontroller	80C51-Based
Package Type	DIP-40	-
Operating Voltage (Vcc)	Supply Voltage Range	2.0 to 6.0 V
Operating Temperature	Junction Temperature Range	-40掳C to +85掳C
Clock Frequency	Internal Oscillator	0 to 33 MHz
Flash Memory	Program Memory Size	8 KB
EEPROM	Data Memory Size	256 Bytes
RAM	Internal RAM	256 Bytes
I/O Ports	Number of I/O Lines	32
Timers/Counters	Number of Timers/Counters	3
Watchdog Timer	On-Chip Watchdog Timer	Yes
Interrupt Sources	Number of Interrupt Sources	14
Power Management	Low-Power Modes	Idle, Power Down
Serial Communication	UART, SPI, I2C	UART, SPI
Packaging	RoHS Compliance	Yes

Instructions for Use:

1. Power Supply:

   • Connect the Vcc pin to a power supply within the operating voltage range (2.0 to 6.0 V).
   • Ground the GND pin.

2. Clock Configuration:

   • Connect an external crystal or ceramic resonator between the XTAL1 and XTAL2 pins for clock generation.
   • Alternatively, use an external clock source by connecting it to the XTAL1 pin.

3. Reset:

   • Apply a high-level signal to the RST pin for at least two machine cycles to reset the microcontroller.
   • A capacitor and resistor can be used to create a simple RC reset circuit.

4. Programming:

   • Use an in-circuit programmer to program the flash memory.
   • Ensure the programming voltage (Vpp) is applied correctly if required by the programmer.

5. I/O Configuration:

   • Configure the I/O ports using the appropriate registers (P0, P1, P2, P3).
   • Set the direction of each port pin as input or output by writing to the corresponding port register.

6. Interrupts:

   • Enable interrupts by setting the appropriate bits in the IE (Interrupt Enable) register.
   • Write interrupt service routines (ISRs) to handle specific interrupt sources.

7. Timers/Counters:

   • Initialize the timers/counters by setting the TMOD (Timer Mode) register.
   • Start the timer/counter by setting the TR0 or TR1 bit in the TCON (Timer Control) register.

8. Serial Communication:

   • Configure the UART by setting the SCON (Serial Control) register.
   • Set the baud rate by writing to the TH1 and TL1 registers.

9. Low-Power Modes:

   • Enter idle mode by setting the IDL bit in the PCON (Power Control) register.
   • Enter power-down mode by setting the PD bit in the PCON register.

10. Watchdog Timer:

    • Enable the watchdog timer by setting the WDTE bit in the WDTCON (Watchdog Timer Control) register.
    • Reset the watchdog timer by writing to the WDT register to prevent a system reset.

11. EEPROM:

    • Use the EEPROM functions provided in the datasheet to read from and write to the on-chip EEPROM.

12. General Considerations:

    • Ensure all unused I/O pins are tied to a known state (high or low) to avoid floating inputs.
    • Use decoupling capacitors near the power supply pins to reduce noise and improve stability.

(For reference only)