NXP Semiconductors P80C32X2BA,512

Overview

P80C32X2BA from Philips Semiconductors is a ROMless 8-bit microcontroller based on the enhanced 80C51 architecture, featuring 256 bytes of on-chip RAM, three 16-bit timers/counters (T0, T1, T2), full-duplex UART with framing error detection, and support for both 6-clock and 12-clock operation. It operates from 2.7 V to 5.5 V and delivers up to 33 MHz at 5 V in 12-clock mode - used in industrial control panels requiring low-voltage, low-power embedded logic with external program memory.

For engineers reviewing the P80C32X2BA datasheet, P80C32X2BA pinout, P80C32X2BA application, or P80C32X2BA equivalent, key selection criteria include its PLCC44 package with verified 44-pin mapping, dual clock-mode configurability via CKCON.X2, idle/power-down power management, and compatibility with standard 80C51 development toolchains and external EPROM/Flash boot sources.

Technical Context

This device implements a static CMOS 80C51 core with extended peripherals including Timer 2 (capture/compare), programmable clock-out on P1.0, and asynchronous port reset. Its dual-clock architecture allows runtime switching between 6-clock (2× speed) and 12-clock modes without hardware change.

The P80C32X2BA lacks on-chip nonvolatile program memory but retains full 80C51 instruction set compatibility, SFR layout, and interrupt structure - supporting external code execution via PSEN-controlled ROM/EPROM or Flash. Its power-down mode preserves RAM contents down to 2.0 V and enables wake-up via INT0/INT1 when WUPD bit is enabled.

Key Specifications

Pinout & Package

Package: PLCC44 (SOT187-2), plastic leaded chip carrier, 44-lead, 0 °C to +70 °C operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT89C51RC2-UM and P87C52X2BA, the P80C32X2BA provides unique ROMless flexibility for prototyping and multi-firmware platforms, retains T2-based clock generation absent in AT89C51RC2, and avoids OTP programming dependency required by P87C52X2BA - making it optimal for externally managed code and timing-critical peripheral interfacing.

Availability

P80C32X2BA is available at Aetrix Electronics and suitable for industrial HMI controllers, legacy equipment retrofits, smart sensor nodes, and power-meter communication modules requiring stable component supply and long-term obsolescence mitigation.

Supply support for P80C32X2BA 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

Philips Semiconductors (now NXP Semiconductors) is a Dutch semiconductor company founded in 1953, specializing in analog, logic, and microcontroller solutions for industrial, automotive, and consumer markets.

The P80C32X2BA belongs to the 80C51X2 family - designed specifically for cost-sensitive, low-power embedded systems requiring 8051 compatibility, flexible clocking, and robust external memory interfacing without on-chip nonvolatile storage.

FAQ

What is the maximum operating frequency of the P80C32X2BA and under what conditions?

The P80C32X2BA supports up to 33 MHz at 5 V in 12-clock mode and 30 MHz at 5 V in 6-clock mode. At lower voltages (2.7–5.5 V), the maximum guaranteed frequency is 16 MHz in both modes. These ratings assume proper decoupling, stable crystal/resonator, and compliance with AC timing specifications in the Philips P80C3xX2 datasheet.

Does the P80C32X2BA have on-chip program memory?

No, the P80C32X2BA is a ROMless variant - it contains no internal ROM, EPROM, or Flash memory. It executes code exclusively from external program memory (e.g., EPROM, Flash, or ROM) accessed via PSEN and the multiplexed P0/P2 address/data bus. This distinguishes it from OTP variants like P87C52X2BA.

How is the P80C32X2BA's Timer 2 used for clock generation?

The P80C32X2BA's Timer 2 generates a 50% duty-cycle clock on P1.0 by clearing C/T2 (T2CON.1), setting T2OE (T2MOD.1), and enabling TR2 (T2CON.2). The output frequency depends on oscillator speed and RCAP2H/L reload value per the formula: Oscillator Frequency / [n × (65536 − RCAP2)]. n = 4 (12-clock) or 2 (6-clock).

Can the P80C32X2BA wake from Power-down mode using an external interrupt?

Yes, the P80C32X2BA can wake from Power-down mode via INT0 or INT1 when the WUPD bit (AUXR1.3) is set to 1. The interrupt must be level-sensitive and held low to restart the oscillator; releasing the pin high completes wake-up. RAM and SFRs retain their values, unlike reset-based wake-up which reinitializes SFRs.

What package and temperature grade does the P80C32X2BA carry?

The P80C32X2BA uses a PLCC44 package (SOT187-2) with 44 leads and is rated for commercial temperature range: 0 °C to +70 °C. Its pinout matches standard 80C51 derivatives and includes dedicated T2/T2EX pins on P1.0/P1.1 - confirmed in Philips document SU01062.