Details

---

BUY P8255A-5 https://www.utsource.net/itm/p/12606836.html

Parameter	Description	Value
Part Number	-	P8255A-5
Function	-	Programmable Peripheral Interface (PPI)
Supply Voltage (Vcc)	Operating Voltage Range	4.75V to 5.25V
Operating Temperature	-	-40掳C to +85掳C
Storage Temperature	-	-65掳C to +150掳C
I/O Ports	Number of Ports	3 (Port A, Port B, Port C)
Port A	Data Direction	Bidirectional (Input/Output)
Port B	Data Direction	Bidirectional (Input/Output)
Port C	Data Direction	Bidirectional (Input/Output)
Data Bus Width	-	8-bit
Control Register	-	1 byte (8 bits)
Power Consumption	Typical at 5V, 1MHz	200mW
Package Type	-	DIP-40 or PLCC-44
Pin Count	-	40 (DIP) or 44 (PLCC)

Instructions for Use:

1. Power Supply:

   • Connect Vcc to a stable 5V power supply.
   • Connect GND to the system ground.

2. Reset:

   • Apply a low signal to the RESET pin to initialize the P8255A-5. This sets all ports to input mode.

3. Control Register Programming:

   • Write to the control register to configure the direction of each port (input or output).
   • The control register address is typically set by the system and is used to write configuration data.

4. Data Transfer:

   • Use the data bus to read from or write to the I/O ports.
   • Port A, Port B, and Port C can be configured as input or output based on the control register settings.

5. Interrupt Handling:

   • The P8255A-5 supports interrupts. Configure the interrupt enable and status registers to manage interrupt conditions.

6. Port Configuration:

   • Port A can be configured as two 4-bit ports or one 8-bit port.
   • Port B is always an 8-bit port.
   • Port C can be configured as two 4-bit ports or one 8-bit port.

7. Timing Considerations:

   • Ensure that the clock frequency does not exceed the maximum specified for the device.
   • Follow the setup and hold times for data and control signals to avoid timing violations.

8. Handling and Storage:

   • Store the device in a dry, cool place within the specified storage temperature range.
   • Handle with care to avoid static damage. Use proper ESD protection when handling the device.

9. Schematic Integration:

   • Integrate the P8255A-5 into your system schematic, ensuring proper connections to the microprocessor, memory, and other peripherals.

10. Testing:

    • After assembly, test the device to ensure it functions correctly. Verify the configuration and data transfer operations using a logic analyzer or similar tool.

For detailed specifications and additional information, refer to the datasheet provided by the manufacturer.

(For reference only)