NXP Semiconductors PXAG49KFA/00,512

Overview

PXAG49KFA/00,512 from NXP Semiconductors (formerly Philips) is a 16-bit XA eXtended Architecture microcontroller with 64 KB on-chip Flash program memory, 2 KB SRAM, dual UARTs, three timers/counters, watchdog timer, and 44-pin PLCC package rated for –40 °C to +85 °C operation. It supports In-System Programming (ISP) at single 5 V supply and executes code from internal Flash or up to 1 MB external memory.

For engineers reviewing the PXAG49KFA/00,512 datasheet, PXAG49KFA/00,512 pinout, PXAG49KFA/00,512 application, or PXAG49KFA/00,512 equivalent, this device serves as a drop-in upgrade path from XA-G3 in industrial control, serial communication gateways, and legacy 80C51-based embedded systems requiring extended address space and Flash reprogrammability.

Technical Context

The PXAG49KFA/00,512 implements the XA CPU core - an enhanced 80C51 architecture supporting 20-bit external addressing (A0–A19), 16-bit data pointers, and segmented memory access via SSEL register. Its dual UARTs operate independently with programmable baud rates and support RS-232-level interfacing via external transceivers.

Flash memory is partitioned into five blocks (2×8 KB + 3×16 KB), enabling selective erasure; Boot ROM at F800h–FFFFh provides ISP loader and low-level Flash routines. Power management includes Idle and Power-Down modes, with wake-up from Power-Down via external interrupt.

Key Specifications

Pinout & Package

Package: 44-pin Plastic Leaded Chip Carrier (PLCC), SOT187-2 footprint, lead-free compatible per manufacturer documentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PXAG49KBA/00,512 and PXAG49KBBD/00,512, the PXAG49KFA/00,512 uniquely combines industrial temperature rating with PLCC packaging - enabling robust deployment in harsh environments where socket-based maintenance or thermal cycling resilience is critical.

Availability

PXAG49KFA/00,512 is available at Aetrix Electronics and suitable for industrial automation, legacy system upgrades, and embedded data logging requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PXAG49KFA/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, formerly Philips Semiconductors, designs high-reliability microcontrollers for industrial, automotive, and IoT applications with emphasis on longevity and ecosystem support.

The XA-G49 belongs to the XA 16-bit microcontroller family, engineered to extend the 80C51 architecture with larger memory, enhanced peripherals, and Flash-based field-upgradability for cost-sensitive embedded control systems.

FAQ

What is the maximum operating frequency of the PXAG49KFA/00,512?

The PXAG49KFA/00,512 operates at up to 30 MHz with a 5.0 V ±5% supply. This frequency is validated across its full industrial temperature range (–40 °C to +85 °C). The oscillator circuit accepts either a quartz crystal (XTAL1/XTAL2) or external clock signal, and timing-critical peripherals-including timers and UARTs-are synchronized to this clock source. The PXAG49KFA/00,512 datasheet specifies typical current consumption of 90 mA at 30 MHz and 5 V.

Does the PXAG49KFA/00,512 support In-System Programming (ISP) at 5 V?

Yes, the PXAG49KFA/00,512 supports single-supply ISP at VDD = 5 V. Its internal VPP generator activates when ENBOOT is set and VPP is tied to VDD, eliminating the need for an external 12 V supply. Programming is performed via UART0 using the factory-default boot loader, requiring only TxD, RxD, VSS, VDD, and RST connections. The PXAG49KFA/00,512 achieves full Flash reprogramming without removing the device from the target board.

How is Flash memory organized in the PXAG49KFA/00,512?

The PXAG49KFA/00,512 contains 64 KB of on-chip Flash memory divided into five independently erasable blocks: two 8 KB blocks (0000h–3FFFh) and three 16 KB blocks (4000h–FFFFh). This structure enables selective firmware updates without erasing the entire memory. The Boot ROM occupies the top 2 KB (F800h–FFFFh) when enabled via ENBOOT; disabling ENBOOT restores full 64 KB Flash accessibility for user code execution.

What I/O port configuration options does the PXAG49KFA/00,512 provide?

The PXAG49KFA/00,512 offers per-pin programmable output types across all four 8-bit ports (P0–P3): quasi-bidirectional, push-pull, open-drain, or input-only. Configuration is controlled by dedicated SFRs (e.g., P0CFGA/P0CFGB). During reset, ports default to quasi-bidirectional mode if executing from internal Flash (EA = 1), or push-pull for external bus pins if EA = 0. This flexibility simplifies interface design with diverse peripheral loads and voltage levels.

Can the PXAG49KFA/00,512 operate with external program memory?

Yes, the PXAG49KFA/00,512 supports up to 1 MB of external program memory when EA is held low at reset, configuring the device to fetch code exclusively from external sources. Address lines A0–A19 are provided via P0 (AD0–AD7) and P2 (A8–A19), with control signals including PSEN, ALE, and RD. Internal 64 KB Flash remains accessible for data storage or hybrid execution models, and the device maintains full peripheral functionality-including both UARTs and timers-regardless of memory source.