NXP Semiconductors P89C52X2BN/00,112

Overview

P89C52X2BN/00,112 from NXP Semiconductors (formerly Philips) is an 8-bit Flash microcontroller based on the enhanced 80C51 architecture, featuring 8 KB on-chip Flash program memory, 256 bytes of RAM, three 16-bit timers/counters (T0, T1, T2), and a full-duplex UART with framing error detection - deployed in industrial control panels requiring deterministic real-time I/O handling and firmware field-upgradability.

For engineers reviewing the P89C52X2BN/00,112 datasheet, P89C52X2BN/00,112 pinout, P89C52X2BN/00,112 application, or P89C52X2BN/00,112 equivalent, this page delivers verified technical context, validated pin functions for DIP40 package, confirmed low-power modes (idle/power-down), exact Flash endurance (10,000 cycles), and two manufacturer-confirmed alternative parts with documented functional and packaging differences.

Technical Context

This device implements a static CMOS 80C51 core supporting both 6-clock and 12-clock operation via CKCON.X2 bit or Flash-programmed FX2 bit, enabling software-selectable CPU throughput scaling (e.g., 20 MHz at 6-clock vs. 33 MHz at 12-clock with 5 V supply). It integrates dual data pointers, four interrupt priority levels, six interrupt sources, and asynchronous port reset capability.

The P89C52X2BN/00,112 uses a dedicated Timer 2 (T2) with capture/compare and programmable clock-out functionality, while retaining standard 80C51-compatible T0/T1 operation across all four modes (0–3). Its Flash memory supports chip erase and individual byte programming, with 10-year data retention and security bits for code protection.

Key Specifications

Pinout & Package

Package: Plastic Dual In-Line Package (DIP40), 600 mil width, SOT129-1 footprint, operating temperature range 0 °C to +70 °C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit Flash microcontroller applications.

Compared with P89C51X2BN/00,112 and P89C54X2BN/00,112, the P89C52X2BN/00,112 provides optimal balance: sufficient Flash for Modbus/ASCII protocols and sensor processing logic, full pin compatibility with both alternatives, and identical power management features - making it the preferred choice for mid-complexity industrial controllers where memory and cost must be tightly balanced.

Availability

P89C52X2BN/00,112 is available at Aetrix Electronics and suitable for industrial motor control, legacy equipment retrofit, and energy metering interface applications requiring stable component supply, long-term obsolescence mitigation, and traceable sourcing from authorized channels.

Supply support for P89C52X2BN/00,112 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The P89C5xX2 family was designed as a Flash-based evolution of the 80C51 architecture - delivering field-upgradable firmware, enhanced timers, and low-power modes for cost-sensitive industrial control and instrumentation systems.

FAQ

What is the maximum operating frequency of the P89C52X2BN/00,112 and how does clock mode affect it?

The P89C52X2BN/00,112 supports up to 33 MHz in 12-clock mode and 20 MHz in 6-clock mode, both at 5 V ±10%. The clock mode is selected via the CKCON.X2 bit (software) or Flash-programmed FX2 bit (parallel programmer). In 6-clock mode, each instruction executes in half the time of 12-clock mode, effectively doubling throughput without changing oscillator frequency - a key advantage for latency-critical control loops in the P89C52X2BN/00,112.

Does the P89C52X2BN/00,112 support in-system programming, and what interface is required?

The P89C52X2BN/00,112 does not support ISP via UART or SPI. Programming requires a parallel programmer compatible with the P89C5xX2 series, applying VPP (12 V) to EA/VPP pin (31) and using ALE/PROG (30) as the programming pulse input. The device's Flash memory is erased and programmed byte-by-byte or via chip-erase, with 10,000 guaranteed cycles - a constraint explicitly defined for the P89C52X2BN/00,112 in its preliminary datasheet.

How does the P89C52X2BN/00,112 handle reset and power management during brown-out conditions?

The P89C52X2BN/00,112 relies on external reset circuitry (RC network on RST pin) for reliable power-on reset. While it retains RAM contents down to 2.0 V in power-down mode, it lacks built-in brown-out detection. System designers must implement external voltage supervisors (e.g., MAX809) to assert RST during undervoltage - a requirement confirmed by the P89C52X2BN/00,112's DC characteristics table and power-mode specifications.

Can Timer 2 on the P89C52X2BN/00,112 operate simultaneously as a baud-rate generator and a clock-out source?

Yes - Timer 2 on the P89C52X2BN/00,112 can generate both baud rate and clock-out concurrently. When configured for clock-out (C/T2 = 0, T2OE = 1, TR2 = 1), it outputs a 50% duty-cycle signal on P1.0 while still providing baud-rate timing to the UART. However, both functions share the same reload value (RCAP2H/L), so the baud rate and clock-out frequency are mathematically linked - a behavior explicitly documented for the P89C52X2BN/00,112 in the "Programmable Clock-Out Pin" section.

What are the security features of the P89C52X2BN/00,112 and how are they implemented?

The P89C52X2BN/00,112 includes three programmable security bits stored in the Flash Security Block. When programmed, these bits prevent external readout of Flash contents and lock EA/VPP functionality after reset. Bit 1 latches EA internally, forcing execution from internal memory only. These bits are one-time programmable via parallel programmer and cannot be cleared - a permanent protection mechanism confirmed for the P89C52X2BN/00,112 in the "FLASH EPROM MEMORY" section.