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NXP Semiconductors P89C51RC2BBD/01,55
- Part No.:
- P89C51RC2BBD/01,55
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LQFP
- Datasheet:
-
P89C51RC2BBD/01,55.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 44LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,454
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Product details
Overview
P89C51RC2BBD/01 from NXP Semiconductors (formerly Philips) is an 8-bit 80C51-compatible Flash microcontroller with 32 KB ISP/IAP Flash, 512 B RAM, four 8-bit I/O ports, three 16-bit timers, enhanced UART, and Programmable Counter Array (PCA) supporting PWM and capture/compare functions. It operates at up to 20 MHz in 6-clock mode (40 MHz equivalent performance) and targets embedded control applications requiring field-upgradable firmware and precise timing.
For engineers reviewing the P89C51RC2BBD/01 datasheet, P89C51RC2BBD/01 pinout, P89C51RC2BBD/01 application, or P89C51RC2BBD/01 equivalent, key selection criteria include Flash size (32 KB), 6-/12-clock mode flexibility, PCA-based PWM capability, LQFP-44 package compatibility, and support for In-System Programming via UART boot loader.
Technical Context
The P89C51RC2BBD/01 implements a static CMOS 80C51 core with full instruction set compatibility and extends it with dual clock modes (6- or 12-clock per machine cycle), selectable per-peripheral via CKCON register bits. Its PCA module provides five independent capture/compare channels (CEX0–CEX4) and hardware PWM generation without CPU intervention.
It integrates a boot ROM containing low-level Flash programming routines enabling UART-based ISP without external loader code, and supports In-Application Programming (IAP) using on-chip ROM routines to reprogram Flash while executing user code - critical for remote firmware updates over modem links.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible 8-bit CPU with 100% instruction set compatibility |
| Flash Memory | 32 KB ISP/IAP Flash - enables field firmware updates and self-reprogramming |
| RAM | 512 B on-chip RAM - sufficient for real-time control stacks and small buffers |
| Clock Modes | Configurable 6-clock (20 MHz max) or 12-clock (33 MHz max) operation - selectable via Flash bit FX2 or SFR X2 |
| Peripherals | Three 16-bit timers, enhanced UART with framing error detection, and 5-channel PCA with PWM/capture/compare |
| I/O Ports | Four 8-bit bidirectional ports (P0–P3), with port 1 offering dedicated PCA I/O (CEX0–CEX4) |
| Package | LQFP-44 (SOT389-1) - surface-mount, 10 mm × 10 mm footprint, suitable for compact industrial PCBs |
Pinout & Package
Package: LQFP-44 (SOT389-1), 10 mm × 10 mm, 0.8 mm pitch, lead-free compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Port 0 I/O / AD0–AD7 | Open-drain bidirectional port; multiplexed address/data bus for external memory access |
| P1.0–P1.7 | Port 1 I/O / T2, T2EX, ECI, CEX0–CEX4 | Dedicated PCA interface: CEX0–CEX4 support PWM output, input capture, and compare operations |
| P2.0–P2.7 | Port 2 I/O / A8–A15 | Bidirectional port; outputs high-order address byte during 16-bit external memory accesses |
| P3.0–P3.7 | Port 3 I/O / RxD, TxD, INT0–INT1, T0–T1, WR, RD | Secondary function port: UART, external interrupts, timer inputs, and external memory strobes |
| RST | Reset Input | Active-high reset requiring ≥2 machine cycles; supports power-on reset with RC network |
| XTAL1 / XTAL2 | Oscillator Inputs | Supports crystal (1–20 MHz) or external clock source; enables on-chip oscillator circuit |
| EA/VPP | External Access Enable / Programming Voltage | High = execute from internal Flash; low = fetch from external program memory; VPP = 12.5 V during Flash programming |
| ALE/PROG | Address Latch Enable | Outputs address latch pulse during external memory access; programmable disable via AUXR.0 |
Key Features
| Feature | Design Value |
|---|---|
| In-System Programming (ISP) | UART-based Flash update without removing MCU from board - enabled by boot ROM loader |
| In-Application Programming (IAP) | User code can erase/reprogram Flash sectors while running - enables remote firmware upgrades |
| Programmable Clock-Out | P1.0 outputs 50% duty cycle clock (61 Hz–8 MHz range) - usable as system clock source or test signal |
| 6-/12-Clock Mode Flexibility | CPU and peripherals independently configurable for 6- or 12-clock timing - balances speed vs. power |
| Enhanced UART | Full-duplex with framing error detection and automatic address recognition - improves RS-485 reliability |
| Low-Power Modes | Idle (peripherals active) and Power-Down (oscillator stopped) - reduces current to µA range |
Applications
| Motor Control System | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Closed-loop DC motor speed regulation using feedback from encoder pulses and analog current sensing. IC Role / Device Role / Timing Role: P89C51RC2BBD/01 executes PID algorithm, generates PWM via PCA (CEX0–CEX2), captures encoder edges, and communicates status via UART. Use Value: Hardware PWM and input capture eliminate software timing jitter; 32 KB Flash accommodates multiple motor profiles and safety logic. |
Use Scenario: Local I/O expansion node in distributed control system, collecting digital inputs and driving relay outputs. IC Role / Device Role / Timing Role: P89C51RC2BBD/01 scans 32 discrete inputs via Port 0/2, drives outputs via Port 1, and reports state over RS-485 using enhanced UART framing detection. Use Value: Four priority-level interrupts ensure timely response to emergency stop signals; 512 B RAM holds input/output image and protocol buffers. |
| Smart Energy Meter Interface | Legacy Equipment Retrofit Controller |
|
Use Scenario: Communication bridge between metrology ASIC (SPI) and host MCU (UART), with tamper detection and secure logging. IC Role / Device Role / Timing Role: P89C51RC2BBD/01 reads SPI data from ADC, timestamps events using Timer 2, stores logs in Flash, and transmits via UART with CRC. Use Value: IAP allows field updates of tamper-response algorithms; 32 KB Flash stores firmware + encrypted event log history. |
Use Scenario: Replacement controller for aging electro-mechanical equipment, replicating timing behavior of legacy 8051-based design. IC Role / Device Role / Timing Role: P89C51RC2BBD/01 emulates original 8051 timing with 12-clock mode, retains same pinout and interrupt vector mapping. Use Value: Pin-compatible drop-in replacement with identical SFR layout; eliminates PCB redesign while adding ISP capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit Flash microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT89C51RD2-RL24 | 64 KB Flash, 1 KB RAM, same 8051 core and LQFP-44 package; lacks PCA but adds SPI interface | Better suited for data-logging systems needing larger code space and serial peripheral expansion | Select when >32 KB Flash is required and PCA is not needed; verify UART timing compatibility |
| P89V51RD2BBD,55 | Same 64 KB Flash/1 KB RAM spec as AT89C51RD2 but includes PCA and enhanced UART; manufactured by NXP | Direct functional upgrade path with backward-compatible pinout and extended timing features | Choose for migration from P89C51RC2BBD/01 where higher Flash density and retained PCA are needed |
Compared with AT89C51RD2-RL24 and P89V51RD2BBD,55, the P89C51RC2BBD/01 offers optimal balance of 32 KB Flash, PCA-based PWM, and proven field-programmability - making it ideal for cost-sensitive motor control and I/O modules where code size and timing precision are constrained.
Availability
P89C51RC2BBD/01 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC I/O modules, smart energy meter interfaces, and legacy equipment retrofit projects requiring stable component supply and long-term manufacturing continuity.
Supply support for P89C51RC2BBD/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.
The P89C51RC2BBD/01 belongs to NXP's legacy 80C51 Flash microcontroller family, designed specifically for cost-effective, field-upgradable embedded control in industrial automation and instrumentation.
FAQ
What is the maximum operating frequency of the P89C51RC2BBD/01 in 6-clock mode?
The P89C51RC2BBD/01 supports up to 20 MHz in 6-clock mode, delivering 40 MHz equivalent performance relative to standard 80C51 devices. This mode is selected via the FX2 Flash bit or CKCON.X2 SFR bit, and enables higher throughput for time-critical control loops without increasing oscillator frequency.
Does the P89C51RC2BBD/01 support In-Application Programming (IAP)?
Yes, the P89C51RC2BBD/01 supports IAP using ROM-resident Flash programming routines. User firmware can erase and reprogram Flash sectors while executing - essential for remote firmware updates over modem or wireless links without halting system operation.
Which pins on the P89C51RC2BBD/01 support PWM output?
The P89C51RC2BBD/01 uses its Programmable Counter Array (PCA) to generate PWM on P1.3 (CEX0), P1.4 (CEX1), P1.5 (CEX2), P1.6 (CEX3), and P1.7 (CEX4). Each channel supports independent duty-cycle control and frequency configuration via CCAPMn and CCAPnL/H registers.
What is the purpose of the EA/VPP pin on the P89C51RC2BBD/01?
The EA/VPP pin on the P89C51RC2BBD/01 serves dual roles: when held high, it enables execution from internal 32 KB Flash; when pulled low, it forces code fetches from external program memory. During Flash programming, it accepts 12.5 V VPP for write operations - latched at reset release.
Can the P89C51RC2BBD/01 operate from a 3.3 V supply?
No, the P89C51RC2BBD/01 is specified only for 4.5–5.5 V operation per the ordering information table and electrical characteristics. It does not support 3.3 V supply voltage - attempting to operate below 4.5 V may result in unreliable Flash programming, reset behavior, or I/O functionality.
P89C51RC2BBD/01,55 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LQFP
- Series:
- 89C
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 33MHz
- Connectivity:
- UART/USART
- Peripherals:
- POR, PWM, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 512 x 8
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P89C51RC2BBD/01,55 FAQ
1.How can I place an order for P89C51RC2BBD/01,55 through Aetrix?
Please submit a Request for Quotation (RFQ) for P89C51RC2BBD/01,55 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for P89C51RC2BBD/01,55 reliable?
The price and inventory of P89C51RC2BBD/01,55 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P89C51RC2BBD/01,55 is usually 5 days.
3.What payment methods are accepted for P89C51RC2BBD/01,55?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P89C51RC2BBD/01,55 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P89C51RC2BBD/01,55?
P89C51RC2BBD/01,55 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P89C51RC2BBD/01,55 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for P89C51RC2BBD/01,55?
For technical support, including P89C51RC2BBD/01,55 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P89C51RC2BBD/01,55 requirements.
6.How does Aetrix verify that P89C51RC2BBD/01,55 is sourced from the original manufacturer or authorized distributors?
All P89C51RC2BBD/01,55 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that P89C51RC2BBD/01,55 meets industry standards.
7.What is the process for return or replacement of P89C51RC2BBD/01,55?
All P89C51RC2BBD/01,55 units undergo pre-shipment inspection (PSI). If there is an issue with P89C51RC2BBD/01,55, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The P89C51RC2BBD/01,55 part is unused and in its original packaging.
Return procedure for P89C51RC2BBD/01,55:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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