NXP Semiconductors P89C664HFBD/00,557

Overview

P89C664HFBD/00,557 from NXP Semiconductors (formerly Philips) is a single-chip 8-bit Flash microcontroller based on the 80C51 architecture, featuring 64 KB ISP/IAP Flash program memory, 2 KB on-chip RAM, and operation up to 20 MHz in 6-clock mode (40 MHz equivalent performance). It integrates four 8-bit I/O ports, three 16-bit timers, an enhanced UART with framing error detection and automatic address recognition, and a programmable counter array (PCA) supporting PWM and capture/compare functions - deployed in motor control and industrial embedded systems.

For engineers reviewing the P89C664HFBD/00,557 datasheet, P89C664HFBD/00,557 pinout, P89C664HFBD/00,557 application, or P89C664HFBD/00,557 equivalent, key selection criteria include its -40°C to +85°C industrial temperature grade, LQFP-44 package with I²C interface (P1.6/SCL, P1.7/SDA), dual clock modes (6/12 cycles per machine cycle), and hardware support for In-Application Programming (IAP) enabling remote firmware updates via UART.

Technical Context

The P89C664HFBD/00,557 executes instructions in 6 clock cycles by default (twice the speed of standard 80C51), with optional 12-cycle mode configurable via OTP bit. Its enhanced UART supports full-duplex communication with framing error detection and automatic address recognition, while the PCA module provides five independent channels for PWM generation, input capture, and software-timed event counting.

It features four priority-level nested interrupts with eight sources, including INT0/INT1, timer overflows, UART receive/transmit, and PCA interrupt flags. The device supports external memory expansion up to 64 KB and includes power management modes - Idle (CPU halted, peripherals active) and Power-Down (oscillator stopped, RAM retained down to 2.0 V) - with asynchronous port reset and low-EMI ALE inhibition.

Key Specifications

Pinout & Package

LQFP-44 package (SOT389-1), 10 mm × 10 mm, 0.8 mm pitch, thermally enhanced with exposed pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT89C51RD2-RL24 and STC89C52RC-PD, the P89C664HFBD/00,557 uniquely combines 64 KB ISP/IAP Flash, hardware I²C, and a 5-channel PCA - enabling deterministic motor control and sensor aggregation without CPU overhead, while maintaining full 80C51 code compatibility.

Availability

P89C664HFBD/00,557 is available at Aetrix Electronics and suitable for industrial motor drives, PLC I/O modules, IPMI baseboard management units, and legacy equipment retrofits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for P89C664HFBD/00,557 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 leader in high-reliability automotive, industrial, and secure connectivity ICs, with deep heritage in 8-bit microcontroller innovation.

The P89C664HFBD/00,557 belongs to the P89C66x Flash microcontroller family - designed specifically for industrial control applications demanding field-upgradable firmware, deterministic real-time response, and mixed-signal peripheral integration without sacrificing 80C51 software compatibility.

FAQ

What is the maximum operating frequency of the P89C664HFBD/00,557 and how does clock mode affect performance?

The P89C664HFBD/00,557 operates up to 20 MHz in default 6-clock mode (delivering 40 MHz equivalent throughput) and up to 33 MHz in optional 12-clock mode. The 6-clock mode doubles instruction execution speed versus standard 80C51, while the 12-clock mode ensures full timing compatibility with legacy 8051 code. Clock mode is set via OTP configuration at programming time and cannot be changed in-circuit.

Does the P89C664HFBD/00,557 support In-System Programming (ISP), and what interface is required?

Yes, the P89C664HFBD/00,557 supports In-System Programming (ISP) via its on-chip UART using the default serial loader in ROM. No external programmer or debug adapter is needed - firmware updates can be performed while the device remains soldered in the target system, using only a UART connection and host-side ISP utility software compatible with the P89C664HFBD/00,557 boot protocol.

How many I²C devices can the P89C664HFBD/00,557 communicate with, and what hardware resources does it use?

The P89C664HFBD/00,557 implements a full hardware I²C controller (SIO1) on dedicated pins P1.6/SCL and P1.7/SDA, supporting multimaster operation and all standard transfer modes. It can communicate with multiple I²C slaves using configurable 7-bit slave addresses stored in S1ADR and S1ADEN registers; no GPIO bit-banging or additional timers are required for I²C protocol handling.

What power management modes does the P89C664HFBD/00,557 support, and how is Power-Down exited?

The P89C664HFBD/00,557 supports Idle mode (CPU halted, peripherals active) and Power-Down mode (oscillator stopped, RAM retained down to 2.0 V). Power-Down is exited by hardware reset or level-sensitive external interrupt on INT0/INT1. After exit, the oscillator requires stabilization time (<10 ms); the CPU resumes execution at the instruction following the one that invoked Power-Down, preserving all RAM and SFR contents except on reset.

Is the P89C664HFBD/00,557 pin-compatible with earlier P89C66x variants, and what package does it use?

Yes, the P89C664HFBD/00,557 uses the LQFP-44 package (SOT389-1) and shares identical pinout and electrical characteristics with other P89C66x devices in the same package variant (e.g., P89C662HFBD, P89C668HFBD). This allows direct substitution within the same footprint, provided Flash size, RAM, and peripheral requirements align with the target application.