NXP Semiconductors PXAG30KBBD,157

Overview

PXAG30KBBD,157 from NXP Semiconductors (formerly Philips Semiconductors) is a 16-bit XA architecture microcontroller designed for high-performance embedded control. It features 512 B on-chip RAM, a watchdog timer, two enhanced UARTs, and operates across 2.7 V to 5.5 V. Its 20-bit address space supports up to 1 MB program/data memory and targets industrial control systems requiring deterministic serial communication and real-time interrupt handling.

For engineers reviewing the PXAG30KBBD,157 datasheet, PXAG30KBBD,157 pinout, PXAG30KBBD,157 application, or PXAG30KBBD,157 equivalent, key selection criteria include its dual UART support with multiprocessor mode, programmable bus width (8/16-bit), Timer 2 capture/auto-reload capability, and compatibility with legacy 80C51 code via XA upward compatibility.

Technical Context

The PXAG30KBBD,157 implements the XA 16-bit CPU core with 24-bit address range capability (configured to 20-bit in this variant), eight 16-bit general-purpose registers, and an instruction set optimized for C and real-time OS use. It supports segmented memory, banked registers, and up to 32 vectored interrupts - enabling efficient context switching in multitasking environments.

Its timing subsystem includes three independent 16-bit timers: Timer 0 and Timer 1 with four modes (including enhanced Mode 0 auto-reload), and Timer 2 with capture, auto-reload (up/down), baud rate generation, and toggle-output functions. All timers share a programmable base clock (Osc/4, Osc/16, or Osc/64) selected via PT1/PT0 bits in the System Configuration Register (SCR).

Key Specifications

Pinout & Package

Package: Plastic low-profile quad flat package (LQFP44), 44-pin, body size 10 × 10 × 1.4 mm, lead pitch 0.8 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 80C51FA516,112, the PXAG30KBBD,157 delivers 10× higher throughput and 20-bit addressing for scalable systems; versus XA-G32KBBD,157, it trades integrated Flash for lower BOM cost and external memory flexibility in fixed-function designs.

Availability

PXAG30KBBD,157 is available at Aetrix Electronics and suitable for industrial control, serial gateway, energy metering, and medical data logging applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for PXAG30KBBD,157 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, with roots in Philips' semiconductor division.

The XA-G30 series was developed to bridge the performance gap between 8-bit 80C51 microcontrollers and 32-bit processors, targeting high-volume embedded systems needing C-friendly architecture, real-time responsiveness, and legacy code compatibility.

FAQ

What is the maximum operating frequency supported by PXAG30KBBD,157?

The PXAG30KBBD,157 does not specify a maximum clock frequency in its datasheet; instead, it defines AC electrical characteristics for oscillator input frequencies up to 24 MHz. Operation at 24 MHz yields a 6 MHz internal instruction rate (Osc/4), which is the highest validated timing condition for all peripherals including UARTs and timers. Exceeding 24 MHz may violate setup/hold timing margins.

Does PXAG30KBBD,157 include on-chip Flash or ROM for program storage?

No, the PXAG30KBBD,157 contains no on-chip non-volatile program memory. It relies entirely on external program memory accessed via its 20-bit address bus and multiplexed data bus. The EA/WAIT pin must be held LOW at reset to force external code execution, as confirmed in the datasheet's PIN DESCRIPTIONS section.

How is the external data bus width configured on PXAG30KBBD,157?

The external data bus width (8-bit or 16-bit) is determined by the logic level on the P3.5/BUSW pin at reset release. A LOW level configures an 8-bit bus with address lines A0–A19; HIGH selects 16-bit mode with A0–A15 and D0–D15. This setting is latched into the Bus Configuration Register (BCR) and cannot be changed dynamically during runtime.

Can PXAG30KBBD,157 operate from a 3.3 V supply?

Yes, the PXAG30KBBD,157 supports 2.7 V to 5.5 V operation per its DC Electrical Characteristics table. At 3.3 V, all specified AC timing parameters remain valid, and the internal voltage regulator ensures stable core operation. However, external bus signals (e.g., P0/P2) will swing rail-to-rail at 3.3 V, requiring compatible 3.3 V peripherals or level translation for 5 V interfaces.

What UART features differentiate PXAG30KBBD,157 from standard 80C51 UARTs?

The PXAG30KBBD,157 UARTs add 9-bit mode with automatic address recognition, multiprocessor communication support, dedicated status flags (FE, BR, OE), and separate buffer and address registers (S0BUF/S0ADDR). These features eliminate software polling for address matching and reduce interrupt latency by >30% compared to bit-banged 80C51 implementations.