NXP Semiconductors P89C58X2BA/00,512

Overview

P89C58X2BA/00,512 from NXP Semiconductors (formerly Philips) is a static 8-bit 80C51 Flash microcontroller with 32 KB on-chip Flash program memory, 256 bytes RAM, three 16-bit timers/counters (T0, T1, T2), full-duplex enhanced UART, and 32 configurable I/O lines. It supports both 12-clock and 6-clock operation modes and targets embedded control applications requiring non-volatile code storage, low-power operation, and legacy 8051 software compatibility.

For engineers reviewing the P89C58X2BA/00,512 datasheet, P89C58X2BA/00,512 pinout, P89C58X2BA/00,512 application, or P89C58X2BA/00,512 equivalent, key selection criteria include Flash endurance (10,000 program/erase cycles), dual clock mode configurability (via CKCON.X2 or FX2 bit), power-down wake-up capability via INT0/INT1, and PLCC44 package compatibility with legacy 8051 toolchains and socketed development systems.

Technical Context

This device implements a fully static CMOS 80C51 core with extended instruction set compatibility, enabling zero-frequency operation and deterministic low-power states. Its architecture integrates a dedicated Timer 2 with capture/compare and programmable clock-out functionality, alongside standard 8051 peripherals including dual data pointers, four priority-level nested interrupts, and asynchronous port reset.

The Flash memory subsystem supports chip-erase and byte-programming with 10-year data retention and security bits for code protection. Clock control is implemented through both SFR-accessible CKCON.X2 and one-time-programmable FX2 bit, allowing runtime or factory-set selection between 12-clock (max 33 MHz) and 6-clock (max 20 MHz) execution modes - critical for timing-critical UART baud rate generation and EMI reduction.

Key Specifications

Pinout & Package

Package: PLCC44 (SOT187-2), plastic leaded chip carrier with 44 leads, 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 AT89C55WD-24PU and P89V51RD2FA, the P89C58X2BA/00,512 offers optimal balance of legacy compatibility, Timer 2 functionality, and 6-clock EMI reduction - making it ideal for cost-sensitive industrial retrofits where minimal hardware changes and proven reliability are paramount.

Availability

P89C58X2BA/00,512 is available at Aetrix Electronics and suitable for industrial motor control, legacy equipment retrofit, smart sensor node, and energy metering interface applications requiring stable component supply and long-term obsolescence management.

Supply support for P89C58X2BA/00,512 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 is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT markets.

The P89C58X2BA/00,512 belongs to NXP's legacy 80C51 Flash microcontroller family, designed specifically for cost-effective, pin-compatible upgrades of NMOS 8051 systems with non-volatile program storage and enhanced low-power operation.

FAQ

What is the maximum operating frequency of the P89C58X2BA/00,512 in 12-clock mode?

The P89C58X2BA/00,512 supports a maximum external clock frequency of 33 MHz in 12-clock mode at 5 V ±10%. This corresponds to an instruction cycle time of 1.21 µs per machine cycle (12 oscillator periods). The device remains fully functional down to 0 Hz due to its static CMOS design, enabling ultra-low-power stop-clock operation without data loss in the P89C58X2BA/00,512.

Does the P89C58X2BA/00,512 support in-system programming (ISP)?

No, the P89C58X2BA/00,512 does not support in-system programming. It requires a parallel programmer for Flash programming, with specific support for the P89C5xX2 device family. Programming is performed via the VPP (EA) pin at 12 V, and the FX2 bit controlling 6-clock mode must be set using the parallel programmer. For ISP-capable alternatives, consider the P89V51RD2FA, which is not functionally identical to the P89C58X2BA/00,512.

How many interrupt sources does the P89C58X2BA/00,512 support, and what are their priority levels?

The P89C58X2BA/00,512 supports six interrupt sources: INT0, INT1, Timer 0, Timer 1, Timer 2, and the serial port. These are managed by a four-priority-level nested interrupt structure, with two bits per interrupt source (PX0, PT0, etc.) in the IP and IPH registers. Priority levels can be dynamically reconfigured in software, enabling flexible real-time response - a key capability distinguishing the P89C58X2BA/00,512 from basic 8051 derivatives.

Can the P89C58X2BA/00,512 generate a precise clock signal for external circuitry?

Yes, the P89C58X2BA/00,512 can generate a precise 50% duty-cycle clock signal on P1.0 using Timer 2 in clock-out mode. The output frequency ranges from 61 Hz to 4 MHz (at 16 MHz oscillator in 12-clock mode) and is calculated as Oscillator Frequency / [n × (65536 − RCAP2H,RCAP2L)], where n = 4 (12-clock) or 2 (6-clock). This eliminates external clock generators in timing-critical subsystems interfacing with the P89C58X2BA/00,512.

What power-saving modes are available on the P89C58X2BA/00,512, and how do they differ?

The P89C58X2BA/00,512 offers two software-controlled low-power modes: Idle mode freezes the CPU while preserving RAM, timers, UART, and interrupt system operation; Power-down mode stops the oscillator entirely, retaining RAM contents down to 2.0 V but halting all peripherals. Wake-up from Power-down is possible via hardware reset or level-sensitive INT0/INT1 (enabled by WUPD bit in AUXR1), making the P89C58X2BA/00,512 suitable for battery-operated applications requiring event-triggered operation.