NXP Semiconductors P89C51RC2BA/01,512

Overview

P89C51RC2BA/01 from NXP Semiconductors (formerly Philips) is a single-chip 8-bit Flash microcontroller based on the 80C51 architecture, featuring 32 KB ISP/IAP Flash program memory, 512 B RAM, four 8-bit I/O ports, three 16-bit timers, and a programmable counter array (PCA) with PWM and capture/compare capability. It operates at up to 20 MHz in 6-clock mode (40 MHz equivalent performance) and supports industrial temperature range (0 to +70 °C) in PLCC-44 package.

For engineers reviewing the P89C51RC2BA/01 datasheet, P89C51RC2BA/01 pinout, P89C51RC2BA/01 application, or P89C51RC2BA/01 equivalent, key selection considerations include its dual-clock mode flexibility (6-/12-clock per machine cycle), on-the-fly peripheral clock configuration via CKCON register, integrated boot ROM for UART-based ISP, and hardware-accelerated PCA for motor control timing functions.

Technical Context

The P89C51RC2BA/01 implements an enhanced 80C51 CPU core with full instruction set compatibility and adds dedicated SFRs for PCA control (CCON, CCAPMn, CCAPnL/H), clock management (CKCON, CMOD), and power modes (PCON). Its 6-clock mode enables higher effective throughput while allowing individual peripherals-including Timer 0/1/2, UART, and PCA-to run at either fosc/6 or fosc/12 via CKCON bit settings.

It integrates a default serial bootloader in ROM enabling In-System Programming over UART without external loader code, and supports In-Application Programming via ROM-resident Flash routines. The device uses a static CMOS design supporting fully static operation, idle mode, power-down mode, and stop-clock functionality with retention of RAM and SFR contents down to 2 V.

Key Specifications

Pinout & Package

Package: Plastic Leaded Chip Carrier (PLCC), 44-pin, SOT187-2 footprint, lead-free compatible (per NXP documentation), operating temperature range 0 to +70 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT89C51ED2-RL24, P89C51RC2BA/01 provides superior motor timing precision via PCA but lacks USB; compared with P89V51RD2FA, it offers lower cost and smaller Flash footprint for applications not requiring >32 KB code space or extended temperature operation.

Availability

P89C51RC2BA/01 is available at Aetrix Electronics and suitable for industrial automation, embedded instrumentation, and legacy 8051-based equipment upgrades requiring stable component supply, long-term lifecycle support, and verified Flash programming compatibility.

Supply support for P89C51RC2BA/01 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 focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in 8-bit microcontroller innovation dating back to Philips Semiconductor.

The P89C51RC2BA/01 belongs to the P89C51Rx2 family - designed specifically to extend the 80C51 architecture with ISP/IAP Flash, flexible clocking, and enhanced peripherals for cost-sensitive industrial control and retrofit applications.

FAQ

What is the default clock mode for P89C51RC2BA/01 after ChipErase?

The P89C51RC2BA/01 defaults to 12-clock mode after ChipErase. This behavior is factory-configured and documented in the Philips preliminary data sheet dated 2002 Jul 18. The Flash configuration bit FX2 can be programmed via parallel programmer or ISP to enable 6-clock mode, and the SFR bit X2 (CKCON.0) allows runtime switching between modes when FX2 is programmed.

Does P89C51RC2BA/01 support UART-based In-System Programming without external hardware?

Yes, P89C51RC2BA/01 includes a default serial loader in ROM that enables In-System Programming via UART without requiring external programming hardware. This feature is explicitly confirmed in the "DESCRIPTION" section of the official datasheet, where it states the boot loader allows serial ISP "without the need for a loader in the Flash code."

How many PCA channels does P89C51RC2BA/01 provide, and what are their functions?

P89C51RC2BA/01 provides five PCA channels (CEX0–CEX4) mapped to P1.3–P1.7. Each channel supports capture, compare, and PWM modes. The PCA module is controlled via dedicated SFRs including CCON, CCAPMn, and CCAPnL/H registers, enabling simultaneous high-resolution timing operations such as motor phase control and pulse-width measurement.

What is the maximum operating frequency of P89C51RC2BA/01 in 6-clock mode?

The P89C51RC2BA/01 supports a maximum operating frequency of 20 MHz in 6-clock mode, delivering effective performance equivalent to 40 MHz in standard 80C51 12-clock implementations. This specification is confirmed in the "SELECTION TABLE" and "OSCILLATOR CHARACTERISTICS" sections of the official datasheet.

Is P89C51RC2BA/01 pin-compatible with other members of the P89C51Rx2 family?

Yes, P89C51RC2BA/01 in PLCC-44 package shares identical pinout with P89C51RA2BA/01, P89C51RB2BA/01, and P89C51RD2BA/01 per the "PINNING" diagrams and ordering table in the datasheet. All use SOT187-2 footprint and assign identical functions to each pin, enabling hardware reuse across Flash size variants.