NXP Semiconductors PXAG30KFA,529

Overview

PXAG30KFA from NXP Semiconductors (formerly Philips Semiconductors) is a 16-bit XA architecture microcontroller designed for high-performance embedded control with upward compatibility to 80C51 code. It features 512 B on-chip RAM, a watchdog timer, two enhanced UARTs, and operates across –40 °C to +85 °C in a 44-pin PLCC package. It targets industrial automation interfaces requiring deterministic serial communication and external bus expansion.

For engineers reviewing the PXAG30KFA datasheet, PXAG30KFA pinout, PXAG30KFA application, or PXAG30KFA equivalent, key selection criteria include its 20-bit address space (1 MB program/data), dual UART support with 9-bit mode and automatic address recognition, and programmable power-down/idle modes for energy-constrained systems.

Technical Context

The PXAG30KFA implements the XA extended architecture CPU core with 24-bit address capability (configured to 20-bit addressing), eight 16-bit general-purpose registers, and an instruction set optimized for C and real-time multitasking. Its three counter/timers-T0, T1, and T2-support auto-reload, capture, and baud rate generation modes, with T2 offering up/down counting and toggle output on overflow.

It supports external memory expansion via an 8- or 16-bit configurable data bus, controlled by the BUSW pin at reset, and uses a single programmable TCLK prescaler (Osc/4, Osc/16, Osc/64) shared across all timers and the watchdog. The device lacks on-chip Flash or ROM-EA/WAIT must be held low to force external program memory access.

Key Specifications

Pinout & Package

Package: 44-pin plastic leaded chip carrier (PLCC), SOT187-2, body size 16.5 × 16.5 × 4.0 mm, lead pitch 1.27 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with SAF-XE164F-48F66L and AT89C51ED2-RLTUM, PXAG30KFA uniquely balances 8051 code compatibility, dual UARTs with advanced framing, and external bus flexibility-making it optimal for industrial gateways needing field-proven reliability and deterministic serial throughput without architectural overhaul.

Availability

PXAG30KFA is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy serial gateways, energy meter communication units, and motor drive control interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PXAG30KFA 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 applications.

The XA-G30 belongs to NXP's legacy XA 16-bit microcontroller family, designed specifically to provide a high-performance, upward-compatible migration path from 80C51 for industrial control systems requiring deterministic real-time behavior and external memory expansion.

FAQ

Does PXAG30KFA include on-chip Flash or ROM memory?

No, PXAG30KFA does not contain any on-chip non-volatile program memory. Its EA/WAIT pin must be held low at reset to force execution from external program memory. This design enables flexible firmware updates and larger code footprints via external EPROM or Flash, but requires careful PCB layout for stable bus timing. PXAG30KFA relies entirely on external memory for code storage while providing 512 B of on-chip static RAM for data.

What is the function of the BUSW pin on PXAG30KFA?

The BUSW pin (P3.5) on PXAG30KFA is sampled at reset release and latched to configure the external data bus width: low = 8-bit mode, high = 16-bit mode. In 8-bit mode, Port 0 carries AD0–AD7 and Port 2 carries A8–A19; in 16-bit mode, Port 0 carries D0–D7 and Port 2 carries A8–A19. This single-pin configuration eliminates the need for external strapping resistors or configuration registers during initialization.

How does the watchdog timer on PXAG30KFA differ from standard 80C51 implementations?

The PXAG30KFA watchdog timer uses a dedicated WDCON register with programmable timeout scaling (PRE2:PRE0 bits) and separate WFEED1/WFEED2 registers to prevent accidental resets. Unlike basic 80C51 watchdogs, it supports software-controlled enable/disable and integrates with the same TCLK prescaler used by timers-ensuring consistent timing across all time-critical peripherals. A watchdog timeout forces a dedicated reset vector, preserving system integrity during firmware hangs.

Can PXAG30KFA UARTs operate simultaneously with different baud rates?

Yes, PXAG30KFA UART0 and UART1 can operate independently at different baud rates. Each UART uses its own SCON register and shares the same TCLK source, but Timer 1 can be assigned to UART0 while Timer 2 serves UART1-enabling concurrent asynchronous communication at distinct rates (e.g., 9600 bps for diagnostics and 115.2 kbps for data streaming). The baud rate generator mode in T2 provides higher precision than T1 alone.

Is PXAG30KFA pin-compatible with other XA-G30 variants like PXAG30KBBD?

No, PXAG30KFA is not pin-compatible with LQFP-packaged variants such as PXAG30KBBD. Although both share identical electrical functionality and register maps, PXAG30KFA uses a 44-pin PLCC (SOT187-2) package with different pin numbering and physical layout versus the 44-pin LQFP (SOT389-1) used by PXAG30KBBD. Board-level interchange requires mechanical redesign and signal routing changes-only same-package variants (e.g., PXAG30KBA) are drop-in replacements.