CMOS PROGRAMMABLE PERIPHERAL INTERFACE The M82C55A is a CMOS version of the 8255A Programmable Peripheral Interface (PPI) manufactured by OKI. Below are its specifications, descriptions, and features:
### **Specifications:**
- **Technology:** CMOS
- **Operating Voltage:** 4.5V to 5.5V
- **Operating Temperature Range:** -40°C to +85°C
- **Power Consumption:** Low power consumption due to CMOS technology
- **Package:** Available in 40-pin DIP (Dual In-line Package) and other compatible packages
- **I/O Ports:** Three 8-bit ports (Port A, Port B, Port C)
- **Control Logic:** Programmable via control word register
### **Descriptions:**
The M82C55A is a general-purpose programmable I/O device designed for interfacing peripheral devices to microprocessors. It provides 24 I/O pins grouped into three 8-bit ports (A, B, and C), which can be configured in different modes (Mode 0, Mode 1, Mode 2) for simple I/O, strobed I/O, or bidirectional data transfer.
### **Features:**
- **Three 8-bit I/O Ports:** Port A, Port B, and Port C (which can be split into two 4-bit ports).
- **Multiple Operating Modes:**
- **Mode 0 (Basic Input/Output):** Simple I/O without handshaking.
- **Mode 1 (Strobed Input/Output):** Handshake signals for synchronized data transfer.
- **Mode 2 (Bidirectional Bus):** Allows bidirectional data transfer (only Port A supports this mode).
- **Bit Set/Reset Capability:** Individual bits of Port C can be set or reset for control applications.
- **Fully TTL Compatible:** Ensures compatibility with TTL logic levels.
- **CMOS Technology:** Provides low power consumption and high noise immunity.
- **Direct Bit Manipulation:** Allows individual control of Port C bits.
This information is based on the manufacturer's datasheet and technical documentation.
