NXP Semiconductors P87C51RD2BBD,157

Overview

P87C51RD2BBD,157 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 at up to 33 MHz in 12-clock mode and targets motor control, industrial automation, and embedded systems requiring high-speed I/O and precise timing.

For engineers reviewing the P87C51RD2BBD,157 datasheet, P87C51RD2BBD,157 pinout, P87C51RD2BBD,157 application, or P87C51RD2BBD,157 equivalent, key selection criteria include its LQFP-44 package, 64 KB OTP/1 KB RAM configuration, 6-/12-clock mode flexibility, PCA-based PWM capability, and support for low-power idle and power-down modes - all critical for resource-constrained real-time control designs.

Technical Context

The P87C51RD2BBD,157 implements an accelerated 80C51 CPU core with dual clocking modes (6- or 12-clock per machine cycle), selectable via OTP bit OX2 or SFR bit X2 in CKCON. Its enhanced peripheral set includes Timer 2 with capture/compare and baud-rate generation, a full-duplex UART with automatic address recognition, and a 5-channel PCA supporting simultaneous PWM outputs and input capture.

It integrates dual data pointers, security bits (3-bit), 64-byte encryption array, and seven interrupt sources across four priority levels. The device supports external memory expansion up to 64 KB ROM and 64 KB RAM, with Port 0 serving as multiplexed AD0–AD7 and Port 2 as A8–A15 during external accesses - enabling flexible system scalability in legacy 8051-based designs.

Key Specifications

Pinout & Package

Package: LQFP-44 (SOT389-1), 10 mm × 10 mm, 0.8 mm pitch, lead-free compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT89C51ED2-RLTUM and STC89C52RC-PD, the P87C51RD2BBD,157 provides OTP-based firmware security, deterministic 64 KB code space, and hardware-accelerated PCA for high-fidelity PWM - making it optimal for production motor drives and safety-critical industrial controllers where reprogramming risk and timing jitter must be eliminated.

Availability

P87C51RD2BBD,157 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC modules, embedded data loggers, and power supply supervisors requiring stable component supply, long-term lifecycle support, and verified OTP microcontroller performance.

Supply support for P87C51RD2BBD,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 delivering high-performance mixed-signal and microcontroller solutions for automotive, industrial, and IoT markets.

The P87C51RD2BBD,157 belongs to NXP's legacy 80C51 family, designed specifically for cost-effective, high-reliability embedded control in industrial automation, motor drives, and instrumentation where OTP security, deterministic timing, and 8051 ecosystem compatibility are essential.

FAQ

What is the maximum operating frequency of the P87C51RD2BBD,157?

The P87C51RD2BBD,157 supports up to 33 MHz at 5 V in 12-clock mode and 30 MHz at 3 V. In 6-clock mode, it achieves equivalent throughput at half the oscillator frequency - e.g., 16.5 MHz crystal yields 33 MHz effective instruction rate. This dual-mode capability allows optimization between EMI reduction and processing speed in the P87C51RD2BBD,157.

Does the P87C51RD2BBD,157 support external memory expansion?

Yes, the P87C51RD2BBD,157 supports up to 64 KB external program memory and 64 KB external data memory. Port 0 provides AD0–AD7 (multiplexed address/data), Port 2 supplies A8–A15, and control signals PSEN, RD, WR, and ALE are available - enabling seamless interfacing with parallel SRAM, EPROM, or flash devices in the P87C51RD2BBD,157.

How many PWM channels does the P87C51RD2BBD,157 provide?

The P87C51RD2BBD,157 provides five independent PWM channels via its Programmable Counter Array (PCA), accessible through P1.3–P1.7 (CEX0–CEX4). Each channel supports configurable duty cycle, frequency, and edge-aligned output - enabling simultaneous control of multiple motors or actuators without CPU intervention in the P87C51RD2BBD,157.

What low-power modes are available on the P87C51RD2BBD,157?

The P87C51RD2BBD,157 offers three low-power modes: Stop Clock (oscillator halted, RAM/SFRs retained), Idle (CPU halted, peripherals active), and Power-Down (oscillator stopped, minimal current draw). Wake-up from Power-Down is supported by external interrupts INT0/INT1, allowing rapid resumption of real-time tasks in battery-operated P87C51RD2BBD,157 applications.

Is the P87C51RD2BBD,157 pin-compatible with other members of the P87C51RA2/RB2/RC2/RD2 family?

Yes, all P87C51RA2/RB2/RC2/RD2 variants share identical pinouts across the same package type (e.g., LQFP-44 for P87C51RD2BBD,157). This allows hardware reuse when scaling code size - for example, migrating from P87C51RC2BBD (32 KB OTP) to P87C51RD2BBD,157 (64 KB OTP) requires only firmware and OTP programming changes, not PCB redesign.