NXP Semiconductors P80C32X2FN,112

Overview

P80C32X2FN,112 from NXP Semiconductors (formerly Philips Semiconductors) is a ROMless 8-bit 80C51 microcontroller with 256-byte RAM, three 16-bit timers/counters (T0, T1, T2), full-duplex UART, and 32 I/O lines. It operates at 2.7–5.5 V, supports both 6-clock and 12-clock modes (max 30/33 MHz), and features idle/power-down low-power modes - used in industrial control panels requiring deterministic timing and legacy system upgrades.

For engineers reviewing the P80C32X2FN,112 datasheet, P80C32X2FN,112 pinout, P80C32X2FN,112 application, or P80C32X2FN,112 equivalent, key selection criteria include its DIP-40 package with industrial temperature range (–40°C to +85°C), absence of on-chip ROM/OTP, programmable clock-out on P1.0, and compatibility with standard 80C51 toolchains and debug infrastructure.

Technical Context

This device implements a static CMOS 80C51 core with dual data pointers, Boolean processor, and fully static operation enabling zero-frequency clock stop. Its architecture includes dedicated SFRs for Timer 2 capture/compare (RCAP2H/L, T2CON, T2MOD) and enhanced UART with framing error detection and automatic address recognition.

Power management is implemented via software-selectable idle mode (CPU halted, peripherals active) and power-down mode (oscillator stopped, RAM retained down to 2.0 V). Wake-up from power-down is supported by level-sensitive INT0 or INT1 when WUPD bit (AUXR1.3) is enabled.

Key Specifications

Pinout & Package

Package: Plastic Dual In-line Package (DIP-40), 600 mil width, lead pitch 2.54 mm, body width 15.24 mm (SOT129-1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 80C51-based microcontroller applications.

Compared with AT89C52-24PU and P87C52X2FN,112, the P80C32X2FN,112 offers unique flexibility for field-upgradable systems via external memory while retaining full 80C51 peripheral compatibility - making it optimal for maintenance-intensive legacy platforms where ROM content changes frequently.

Availability

P80C32X2FN,112 is available at Aetrix Electronics and suitable for industrial control panels, legacy equipment retrofits, and embedded serial gateways requiring stable component supply across extended product lifecycles.

Supply support for P80C32X2FN,112 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors (originally Philips Semiconductors) is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT markets.

The P80C32X2FN,112 belongs to the legacy 80C51 family designed for cost-sensitive, high-reliability industrial control applications where long-term availability, proven toolchain support, and through-hole manufacturability are essential.

FAQ

What is the memory configuration of the P80C32X2FN,112?

The P80C32X2FN,112 is a ROMless 8-bit microcontroller with 256 bytes of on-chip RAM and no internal program memory. It relies entirely on external program memory (e.g., EPROM or Flash) accessed via Port 0 (AD0–AD7), Port 2 (A8–A15), and control signals PSEN, ALE, and EA/VPP. This architecture enables field firmware updates and avoids mask-ROM NRE costs.

Does the P80C32X2FN,112 support both 6-clock and 12-clock operation?

Yes, the P80C32X2FN,112 supports both 6-clock and 12-clock modes via the X2 bit in CKCON register (SFR 8EH) and an OTP clock control bit (OX2). Setting X2 = 1 selects 6-clock mode (doubling instruction throughput), while X2 = 0 defaults to 12-clock mode. The OX2 bit, programmed via parallel programmer, overrides X2 and permanently enables 6-clock mode.

How does the programmable clock-out function work on the P80C32X2FN,112?

The P80C32X2FN,112 can output a 50% duty cycle clock on P1.0 using Timer 2 in clock-out mode. This requires clearing C/T2 (T2CON.1), setting T2OE (T2MOD.1), and enabling TR2 (T2CON.2). The frequency is determined by the oscillator and RCAP2H/L reload value: f_CLKOUT = f_OSC / [n × (65536 − RCAP2)]. In 12-clock mode (n=4), 16 MHz yields up to 4 MHz output.

Can the P80C32X2FN,112 operate at 3.3 V?

Yes, the P80C32X2FN,112 is specified for 2.7 V to 5.5 V operation. At 3.3 V, its maximum clock frequency is 16 MHz in both 6-clock and 12-clock modes per the datasheet's voltage/frequency correlation table. All I/O pins remain TTL/CMOS compatible, and internal peripherals (UART, timers) function normally within this range.

What are the power-down wake-up sources for the P80C32X2FN,112?

The P80C32X2FN,112 supports wake-up from power-down mode via hardware reset or level-sensitive external interrupts on INT0 (P3.2) or INT1 (P3.3). The WUPD bit (AUXR1.3) must be set to enable interrupt wake-up. Upon wake-up, the oscillator restarts; the CPU resumes execution after RETI with RAM and SFR contents preserved - unlike reset, which reinitializes SFRs.