NXP Semiconductors P80C557E4EFB/01,55

Overview

P80C557E4EFB/01,55 from Philips Semiconductors is a ROMless 8-bit microcontroller based on the 80C51 core, featuring 1024 × 8 internal RAM, dual 16-bit timers, a 10-bit ADC with eight analog inputs, two PWM outputs, I²C and UART serial interfaces, and support for Idle/Power-down power reduction modes. It operates from –40°C to +85°C at 4.5–5.5 V and targets industrial control and instrumentation systems requiring embedded signal acquisition and real-time response.

For engineers reviewing the P80C557E4EFB/01,55 datasheet, P80C557E4EFB/01,55 pinout, P80C557E4EFB/01,55 application, or P80C557E4EFB/01,55 equivalent, key selection considerations include its QFP80 package with 80 pins, PLL oscillator option using 32 kHz crystal, software-controllable ALE disable (RFI mode), and extended interrupt structure with 15 sources and two priority levels.

Technical Context

The P80C557E4EFB/01,55 implements an enhanced 80C51-compatible CPU with full instruction set compatibility, including 49 one-byte, 45 two-byte, and 17 three-byte instructions. At 16 MHz system clock, 58% of instructions execute in 0.75 µs and 40% in 1.5 µs; multiply/divide require 3 µs.

It integrates a dedicated 16-bit timer (T2) coupled to four capture registers and three compare registers, enabling precise event timing and waveform generation. The device supports external memory expansion up to 64 Kbytes program and 64 Kbytes data space, with EA pin controlling internal/external code execution routing.

Key Specifications

Pinout & Package

Package: QFP80 (Plastic Quad Flat Pack; 80 leads; SOT318-1). Pin count and physical layout conform to JEDEC MS-026AC standard. Thermal pad not present; lead finish is matte tin.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P80C557E4EFB/01,55, the P89C557E4EFB adds FEEPROM for field-upgradable code but increases die size and cost, while the P83C557E4EFB/YYY1 offers lowest-cost mask ROM at the expense of flexibility - all share identical pinout, peripheral set, and power characteristics.

Availability

P80C557E4EFB/01,55 is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, PLC I/O terminals, and energy meter data acquisition units requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for P80C557E4EFB/01,55 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

Philips Semiconductors (now NXP Semiconductors) is a global semiconductor leader founded in the Netherlands, specializing in high-reliability mixed-signal ICs for industrial, automotive, and consumer markets.

The P8xC557E4 family was designed to extend the 80C51 architecture with integrated analog peripherals (ADC, PWM), enhanced timing resources (capture/compare T2), and EMC-optimized packaging for real-time embedded control in harsh environments.

FAQ

What is the core architecture of the P80C557E4EFB/01,55?

The P80C557E4EFB/01,55 implements a fully compatible 80C51 8-bit CPU core with identical instruction set, addressing modes, and timing behavior. It executes 58% of instructions in 0.75 µs and 40% in 1.5 µs at 16 MHz, supporting binary and BCD arithmetic plus bit manipulation. The P80C557E4EFB/01,55 contains no on-chip program memory, requiring external ROM or Flash for code storage.

Does the P80C557E4EFB/01,55 support external memory expansion?

Yes, the P80C557E4EFB/01,55 supports expansion to 64 Kbytes of external program memory and 64 Kbytes of external data memory using standard TTL-compatible interfaces. Port 0 provides AD0–AD7 multiplexed address/data bus, Port 2 supplies A8–A15 high-order address lines, and P3.6/P3.7 serve as WR/RD strobes. The EA pin determines whether code fetches originate internally (not applicable for ROMless P80C557E4EFB/01,55) or externally.

How does the ADC function on the P80C557E4EFB/01,55?

The P80C557E4EFB/01,55 integrates a 10-bit successive-approximation ADC with eight multiplexed analog inputs routed through Port 5 (P5.0–P5.7). Conversion is triggered either by edge on ADEXS pin or via software write to ADCON register. Programmable autoscan allows sequential sampling across selected channels. Reference voltage is set between AVref+ and AVref–, supporting external or VDD-based scaling.

What power-saving modes does the P80C557E4EFB/01,55 offer?

The P80C557E4EFB/01,55 provides two software-selectable power reduction modes: Idle Mode halts the CPU while preserving RAM, timers, serial ports, and interrupt logic; Power-down Mode freezes the oscillator and disables all clocks except the watchdog and seconds timer, retaining RAM contents. Wake-up from Power-down occurs via external interrupt, seconds interrupt, or RSTIN assertion.

Is the P80C557E4EFB/01,55 pin-compatible with other members of the P8xC557E4 family?

Yes, the P80C557E4EFB/01,55 shares identical QFP80 (SOT318-1) pinout and electrical characteristics with P83C557E4EFB/YYY1 and P89C557E4EFB, differing only in on-chip memory type (ROMless vs. mask ROM vs. FEEPROM). All variants support the same peripheral functions, register maps, and timing specifications, enabling hardware design reuse across firmware variants.