NXP Semiconductors P89C664HFA/00,512

Overview

P89C664HFA/00,512 from NXP Semiconductors (formerly Philips) is an 8-bit Flash microcontroller based on the 80C51 architecture, featuring 64 KB ISP/IAP Flash program memory and 2 KB on-chip RAM. It executes instructions in 6 clock cycles (2× speed vs. standard 80C51), supports up to 20 MHz operation in 6-clock mode, and integrates four 8-bit I/O ports, three 16-bit timers, enhanced UART with framing error detection, I²C interface, and a 5-channel Programmable Counter Array (PCA) for PWM and capture/compare functions - deployed in industrial motor control and embedded IPMI systems.

For engineers reviewing the P89C664HFA/00,512 datasheet, P89C664HFA/00,512 pinout, P89C664HFA/00,512 application, or P89C664HFA/00,512 equivalent, key selection criteria include its -40°C to +85°C industrial temperature grade, PLCC-44 package with verified I²C/SCL/SDA and PCA channel mapping, 6-clock/12-clock mode configurability, and boot ROM-enabled UART-based ISP without external loader.

Technical Context

The P89C664HFA/00,512 implements an accelerated 80C51 CPU core with dual timing modes: default 6-clock-per-machine-cycle execution (20 MHz max) and optional factory-configurable 12-clock mode (33 MHz max). Its memory subsystem includes non-volatile 64 KB Flash with both In-System Programming (ISP) via UART bootloader and In-Application Programming (IAP) using ROM-resident routines.

Peripheral integration centers on a full-duplex enhanced UART with automatic address recognition and framing error detection, a 5-channel PCA supporting PWM generation and edge-triggered capture, and open-drain I²C interface on P1.6/SCL and P1.7/SDA - all operating under four priority-level nested interrupts and low-power modes including Idle and Power-Down with oscillator stop capability.

Key Specifications

Pinout & Package

Package: Plastic Leaded Chip Carrier (PLCC-44), SOT187-2 footprint, lead-free compatible per original Philips specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT89C51ED2-RLTUM, P89C664HFA/00,512 delivers integrated I²C and 5-channel PCA critical for motor control and IPMI, while P89C668HFA/00,512 offers identical functionality with expanded RAM - making P89C664HFA/00,512 the optimal balance of peripheral richness and memory efficiency for mid-complexity industrial firmware.

Availability

P89C664HFA/00,512 is available at Aetrix Electronics and suitable for industrial motor control, IPMI baseboard management, and legacy PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for P89C664HFA/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 (originally Philips Semiconductors) is a global leader in high-reliability microcontrollers and automotive/industrial ICs, with deep heritage in 80C51 derivatives and system-on-chip integration.

The P89C66x family was designed specifically for industrial automation and embedded control applications demanding field-upgradable firmware, deterministic real-time I/O, and mixed-signal peripheral integration - extending the 80C51 architecture with ISP, PCA, and I²C without sacrificing code compatibility.

FAQ

What is the maximum operating frequency of the P89C664HFA/00,512 and how does clock mode affect it?

The P89C664HFA/00,512 operates up to 20 MHz in its default 6-clock-per-machine-cycle mode (delivering 40 MHz equivalent performance), and up to 33 MHz in the optional 12-clock mode. The clock mode is factory-configured and irreversible; 6-clock mode provides higher instruction throughput, while 12-clock mode ensures full compatibility with legacy 80C51 timing-critical code. Both modes are supported within the 4.75–5.25 V supply range.

Does the P89C664HFA/00,512 support In-System Programming (ISP) without external hardware?

Yes, the P89C664HFA/00,512 includes a factory-programmed boot ROM containing low-level Flash programming routines. This allows UART-based ISP directly through P3.0/RxD and P3.1/TxD with no external programmer required - ideal for field firmware updates in deployed equipment. The process uses standard serial loader commands and requires only a 3.3 V or 5 V TTL-level UART interface.

How many PWM outputs can the P89C664HFA/00,512 generate simultaneously, and which pins are used?

The P89C664HFA/00,512 supports up to five independent PWM outputs via its 5-channel Programmable Counter Array (PCA), using pins P1.3/CEX0, P1.4/CEX1, P1.5/CEX2, P3.4/CEX3, and P3.5/CEX4. Each channel supports 8/16-bit resolution, configurable duty cycle, and edge-aligned or center-aligned modes - enabling direct control of up to five MOSFET gates in multi-phase motor drives.

Is the I²C interface on the P89C664HFA/00,512 hardware-accelerated, and what are its limitations?

Yes, the P89C664HFA/00,512 features a dedicated hardware I²C controller (SIO1) on P1.6/SCL and P1.7/SDA, supporting master and slave modes, multi-master arbitration, and automatic START/STOP generation. However, these pins lack internal pull-ups and require external 2.2–10 kΩ pull-up resistors. The controller handles byte transfers autonomously but does not support low-speed I²C mode (<10 kHz).

What power management modes does the P89C664HFA/00,512 support, and how is wake-up handled from Power-Down mode?

The P89C664HFA/00,512 supports Idle mode (CPU halted, peripherals active) and Power-Down mode (oscillator stopped, RAM/SFRs retained down to 2.0 V). Wake-up from Power-Down requires either a hardware reset or level-sensitive external interrupt on INT0 (P3.2) or INT1 (P3.3). The interrupt pin must be held low to restart the oscillator, then brought high to complete wake-up - with execution resuming at the instruction following the Power-Down command.