Programmable timer/counter The UPD71054L is a programmable interval timer (PIT) manufactured by NEC. Below are the factual specifications, descriptions, and features of the part:
### **Manufacturer:** NEC (Nippon Electric Company)
### **Part Number:** UPD71054L
### **Description:**
The UPD71054L is a CMOS-based programmable interval timer (PIT) designed for timing and event counting applications in microprocessor-based systems. It is functionally equivalent to the Intel 8254 but operates at lower power due to its CMOS construction.
### **Key Features:**
- **Three Independent 16-Bit Counters:** Each counter can operate in different modes.
- **Programmable Counting Modes:** Supports six different operating modes, including interrupt generation, rate generation, and square wave generation.
- **CMOS Technology:** Low power consumption compared to NMOS counterparts.
- **Compatibility:** Fully compatible with the Intel 8254 PIT.
- **Clock Frequency:** Supports input clock frequencies up to **8 MHz**.
- **Operating Voltage:** Typically **5V DC**.
- **Package Type:** Available in a **24-pin DIP (Dual In-line Package)**.
- **Applications:** Used in real-time clock generation, event counting, frequency measurement, and waveform generation.
### **Functional Modes:**
1. **Mode 0:** Interrupt on Terminal Count
2. **Mode 1:** Programmable One-Shot
3. **Mode 2:** Rate Generator
4. **Mode 3:** Square Wave Generator
5. **Mode 4:** Software-Triggered Strobe
6. **Mode 5:** Hardware-Triggered Strobe
This information is based solely on the technical specifications provided by NEC for the UPD71054L. No additional guidance or recommendations are included.
