NXP Semiconductors P87C51RD2FBD/01,15

Overview

P87C51RD2FBD/01,15 from NXP Semiconductors (formerly Philips) is an 8-bit OTP microcontroller based on the 80C51 architecture, featuring 64 KB on-chip OTP program memory, 1 KB RAM, four 8-bit I/O ports, three 16-bit timers (T0/T1/T2), a full-duplex enhanced UART with framing error detection, and a programmable counter array (PCA) supporting PWM, capture, and compare functions. It operates from 2.7 V to 5.5 V and supports both 6-clock and 12-clock modes for high-speed execution up to 33 MHz at 5 V - ideal for motor control and industrial embedded systems requiring precise timing and pulse-width modulation.

For engineers reviewing the P87C51RD2FBD/01,15 datasheet, P87C51RD2FBD/01,15 pinout, P87C51RD2FBD/01,15 application, or P87C51RD2FBD/01,15 equivalent, key selection considerations include its LQFP-44 package, –40 °C to +85 °C industrial temperature range, 64 KB OTP capacity, PCA-based PWM generation, and dual clock-mode flexibility for performance vs. power trade-offs in real-time control designs.

Technical Context

The P87C51RD2FBD/01,15 implements an accelerated 80C51 CPU core with full instruction set compatibility and adds architectural enhancements including a dedicated Programmable Counter Array (PCA) with five independent modules (CEX0–CEX4), Timer 2 with capture/compare and baud-rate generation capability, and dual data pointers for efficient external memory access. Its clock system supports factory-configured 12-clock mode with optional software or parallel-programmer-enabled 6-clock mode - delivering up to 2× throughput versus standard 80C51 devices.

It integrates low-power features including Idle and Power-Down modes, programmable clock-out on P1.0 (61 Hz–8 MHz range), asynchronous port reset, and slew-rate-controlled outputs to reduce EMI. The device uses CMOS process technology and supports external memory expansion up to 64 KB ROM and 64 KB RAM via multiplexed address/data bus on Port 0 and high-order address on Port 2.

Key Specifications

Pinout & Package

Package: LQFP-44 (SOT389-1), lead-free, industrial temperature range (–40 °C to +85 °C), 10 mm × 10 mm body, 0.8 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT89C51ED2-RL24 and P89V51RD2FA, the P87C51RD2FBD/01,15 offers OTP-based firmware immutability and proven industrial reliability, while sacrificing field-upgradability - making it optimal for cost-sensitive, high-volume motor control where code integrity and EMI resilience are critical.

Availability

P87C51RD2FBD/01,15 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC I/O modules, smart power supplies, and embedded instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for P87C51RD2FBD/01,15 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, is a global leader in high-performance mixed-signal ICs for automotive, industrial, and consumer applications, with deep expertise in 8-bit microcontroller architectures and embedded system integration.

The P87C51RD2FBD/01,15 belongs to the P87C51RA2/RB2/RC2/RD2 family - designed specifically for real-time embedded control applications demanding deterministic timing, low-voltage operation, and integrated peripherals like PCA and enhanced UART without external support chips.

FAQ

What is the maximum operating frequency of the P87C51RD2FBD/01,15 and how does clock mode affect it?

The P87C51RD2FBD/01,15 supports up to 33 MHz at 5 V in 12-clock mode and 30 MHz in 6-clock mode. In 6-clock mode, each machine cycle requires six oscillator periods instead of twelve, effectively doubling instruction throughput versus standard 80C51 devices. The clock mode is selected either by programming OTP bit OX2 (permanent) or setting SFR bit X2 in CKCON (software-controllable), with OTP override taking precedence. This allows design flexibility between raw speed and EMI-sensitive environments.

Does the P87C51RD2FBD/01,15 support external memory expansion, and what addressing capability does it provide?

Yes, the P87C51RD2FBD/01,15 supports external memory expansion with separate 64 KB address spaces for program and data memory. Port 0 provides the multiplexed AD0–AD7 bus, while Port 2 outputs A8–A15 for 16-bit addressing. When accessing external data memory using MOVX @DPTR, Port 2 emits the high-order address; with MOVX @Ri, it outputs the P2 SFR value. This architecture enables direct connection to SRAM, EPROM, or peripheral ASICs without glue logic in most embedded control applications.

How many PWM channels does the P87C51RD2FBD/01,15 support, and which pins are used?

The P87C51RD2FBD/01,15 supports five independent PWM outputs via its Programmable Counter Array (PCA), using pins P1.3 (CEX0), P1.4 (CEX1), P1.5 (CEX2), P1.6 (CEX3), and P1.7 (CEX4). Each channel can be configured for high-speed PWM generation with 16-bit resolution and adjustable duty cycle, enabling simultaneous control of multiple actuators - such as three-phase motor drives or RGB LED dimming - without CPU intervention.

What low-power modes are available on the P87C51RD2FBD/01,15, and how are they exited?

The P87C51RD2FBD/01,15 offers Idle and Power-Down modes. In Idle mode, the CPU halts but peripherals remain active; exit occurs via any enabled interrupt or hardware reset. In Power-Down mode, the oscillator stops and RAM/SFRs retain state down to 2 V; exit requires either a hardware reset (which clears SFRs) or a level-sensitive external interrupt on INT0/INT1 (which preserves all registers). Both modes reduce current consumption significantly - critical for battery-backed industrial sensors and portable test equipment.

Is the P87C51RD2FBD/01,15 pin-compatible with other members of the P87C51RA2/RB2/RC2/RD2 family?

Yes, the P87C51RD2FBD/01,15 shares identical pinout and electrical characteristics with other variants in the P87C51RA2/RB2/RC2/RD2 family across the same package type (e.g., LQFP-44). All members use the same SFR map, interrupt structure, and peripheral register layout. This allows hardware reuse across designs with different memory configurations - for example, prototyping with P87C51RC2BBD (32 KB) and scaling to P87C51RD2FBD/01,15 (64 KB) without PCB revision.