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NXP Semiconductors P89C51RD2BBD/01,55
- Part No.:
- P89C51RD2BBD/01,55
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LQFP
- Datasheet:
-
P89C51RD2BBD/01,55.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 44LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,909
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Product details
Overview
P89C51RD2BBD/01 from NXP Semiconductors (formerly Philips) is an 8-bit 80C51-compatible Flash microcontroller with 64 KB ISP/IAP Flash, 1 KB RAM, four 8-bit I/O ports, three 16-bit timers, enhanced UART, and Programmable Counter Array (PCA) supporting PWM and capture/compare-designed for motor control, industrial automation, and embedded systems requiring in-field firmware updates.
For engineers reviewing the P89C51RD2BBD/01 datasheet, P89C51RD2BBD/01 pinout, P89C51RD2BBD/01 application, or P89C51RD2BBD/01 equivalent, key selection criteria include 6/12-clock mode flexibility, on-the-fly peripheral clock configuration via CKCON register, 20 MHz (6-clock) / 33 MHz (12-clock) operation, LQFP-44 package compatibility, and hardware reset behavior with asynchronous port initialization.
Technical Context
The P89C51RD2BBD/01 implements a static CMOS 80C51 core with full instruction set compatibility and extends it with dual-clock domain control: CPU clock mode (6/12 clocks per machine cycle) is selected by Flash bit FX2 or SFR bit X2 (CKCON.0), while individual peripherals-including PCA, timers, and UART-can operate at fosc/6 or fosc/12 independently when CPU is in 6-clock mode.
Its enhanced architecture includes a boot ROM with UART-based ISP loader, enabling serial Flash programming without external loader code, and supports In-Application Programming (IAP) via ROM-resident routines for remote firmware updates over modem links-critical for field-deployed equipment maintenance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible 8-bit CPU with 100% instruction set compatibility and static operation down to 0 MHz. |
| Flash Memory | 64 KB ISP/IAP Flash with block erase capability and security lock bits for firmware protection. |
| RAM | 1024-byte on-chip data RAM, expandable externally to 64 KB via MOVX instructions. |
| Clock Modes | Configurable 6-clock (20 MHz max) or 12-clock (33 MHz max) operation; default after ChipErase is 12-clock. |
| I/O & Peripherals | 32 programmable I/O pins across four ports; three 16-bit timers; full-duplex enhanced UART with framing error detection and auto-address recognition; PCA with five capture/compare modules and PWM support. |
| Power Management | Three low-power modes: Idle (CPU halted, peripherals active), Power-down (oscillator stopped, RAM retained), and Stop Clock (frequency scalable to 0 MHz). |
| Package | LQFP-44 (SOT389-1), lead-free compliant, operating temperature range 0 °C to +70 °C. |
Pinout & Package
Package: LQFP-44 (SOT389-1), 10 mm × 10 mm, 0.8 mm pitch, exposed pad optional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Port 0 bidirectional I/O / AD0–AD7 multiplexed bus | Open-drain outputs with internal pull-ups; serves as low-order address/data bus during external memory access. |
| P1.0–P1.7 | Port 1 bidirectional I/O with alternate functions | Includes T2 (P1.0), T2EX (P1.1), ECI (P1.2), and CEX0–CEX4 (P1.3–P1.7) for PCA capture/compare and clock input. |
| P2.0–P2.7 | Port 2 bidirectional I/O / A8–A15 high-order address bus | Internal pull-ups; emits high-order address during 16-bit external memory accesses (MOVX @DPTR). |
| P3.0–P3.7 | Port 3 bidirectional I/O with secondary functions | RxD/TxD (UART), INT0/INT1 (external interrupts), T0/T1 (timer inputs), WR/RD (external memory strobes). |
| RST | Active-high reset input | Two-machine-cycle high pulse required; enables asynchronous port reset and power-on flag (POF) latching. |
| XTAL1/XTAL2 | Crystal oscillator input/output | Supports quartz crystal (1–33 MHz) or external clock source; internal inverting amplifier. |
| EA/VPP | External access enable / programming voltage | High = execute from internal Flash; low = fetch from external program memory; also accepts VPP during Flash programming. |
| ALE/PROG | Address latch enable / programming pulse | Outputs address latch pulse during external memory access; can be disabled via AUXR.0 for timing-critical applications. |
Key Features
| Feature | Design Value |
|---|---|
| In-System Programming (ISP) | Serial Flash reprogramming via UART using built-in boot ROM loader-no external programmer required for field updates. |
| In-Application Programming (IAP) | Firmware self-modification capability using ROM-resident routines, enabling remote upgrades over modem or network link. |
| Flexible Clock Architecture | CPU and peripherals independently configurable for 6-clock or 12-clock timing-enabling performance/power trade-offs per subsystem. |
| Programmable Counter Array (PCA) | Five independent capture/compare modules supporting PWM generation, pulse-width measurement, and software timers with 16-bit resolution. |
| Enhanced UART | Full-duplex operation with framing error detection, automatic address recognition, and variable baud rate via Timer 1 or Timer 2. |
| Low-Power Operation | Idle, Power-down, and Stop Clock modes retain RAM/SFR contents; Power-down draws <10 µA at 3 V with VCC ≥ 2 V. |
Applications
| Motor Control System | Industrial PLC Module |
|---|---|
Use Scenario: Closed-loop DC/BLDC motor drive with real-time current sensing and commutation timing. IC Role / Device Role / Timing Role: Central controller executing PID loop, generating PWM signals via PCA modules, and managing UART-based HMI communication. Use Value: 6-clock mode delivers 20 MHz CPU throughput for fast loop execution; PCA's five CEX channels enable simultaneous PWM output and encoder capture without CPU overhead. | Use Scenario: Compact programmable logic controller with analog/digital I/O expansion and Modbus RTU over RS-485. IC Role / Device Role / Timing Role: Main processor handling ladder logic scan, I/O state management, and serial protocol stack implementation. Use Value: Enhanced UART with framing error detection ensures robust Modbus frame parsing; 64 KB Flash accommodates full runtime interpreter and user program storage. |
| Smart Energy Meter | Embedded Test Instrument |
Use Scenario: DIN-rail mounted electricity meter with tamper detection, pulse output, and infrared/RS-485 communication. IC Role / Device Role / Timing Role: Primary MCU coordinating metrology IC interface (SPI/I²C), pulse generation, secure firmware updates, and real-time clock synchronization. Use Value: IAP capability allows encrypted field updates of tariff tables and security patches; Power-down mode reduces standby consumption below 15 µA. | Use Scenario: Portable handheld tester for sensor calibration, signal generation, and protocol validation in lab environments. IC Role / Device Role / Timing Role: Embedded host managing USB-to-UART bridge, waveform synthesis via PCA PWM, and non-volatile test script storage. Use Value: Boot ROM ISP loader enables rapid firmware recovery in field; LQFP-44 package provides sufficient I/O for mixed-signal front-end interfacing and debug headers. |
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 |
|---|---|---|---|
| AT89C51ED2-RLTUM | 512 B RAM, 64 KB Flash, same LQFP-44 package; lacks PCA but adds SPI and EEPROM; 33 MHz max at 5 V. | No hardware PWM or capture/compare; requires software PWM or external timer IC for motor control. | Select when SPI interface or embedded EEPROM is prioritized over PCA-based timing precision. |
| STC89C52RC-PD | 8 KB Flash, 512 B RAM, PDIP-40 only; no ISP/IAP; lower clock speed (max 33 MHz but no 6-clock mode); no PCA. | Not suitable for field-upgradable systems; limited peripheral integration; no LQFP option. | Choose only for cost-sensitive, fixed-function designs where PCB layout reuse of legacy DIP footprint is mandatory. |
Compared with AT89C51ED2-RLTUM and STC89C52RC-PD, the P89C51RD2BBD/01 uniquely combines 64 KB ISP/IAP Flash, 1 KB RAM, hardware PCA with five CEX channels, and flexible 6/12-clock peripheral clocking-making it optimal for upgradeable embedded controllers requiring precise timing and minimal external components.
Availability
P89C51RD2BBD/01 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC modules, smart energy meters, and embedded test instruments requiring stable component supply, long-term lifecycle support, and verified Flash programming compatibility.
Supply support for P89C51RD2BBD/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 delivering high-performance mixed-signal solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering microcontroller development.
The P89C51RD2BBD/01 belongs to NXP's legacy 80C51 Flash microcontroller family, designed specifically for cost-effective, field-upgradable embedded control in industrial automation, motor drives, and instrumentation where reliability, ISP capability, and peripheral integration are critical.
FAQ
What is the maximum operating frequency of the P89C51RD2BBD/01 in 6-clock mode?
The P89C51RD2BBD/01 supports up to 20 MHz in 6-clock mode, delivering effective performance equivalent to a 40 MHz standard 80C51 device. This mode is configured via the FX2 Flash bit or CKCON.0 (X2) SFR bit. The actual achievable frequency depends on supply voltage (4.5–5.5 V) and ambient temperature (0 °C to +70 °C). The P89C51RD2BBD/01 datasheet specifies this limit under DC and AC characteristics tables.
Does the P89C51RD2BBD/01 support In-Application Programming (IAP)?
Yes, the P89C51RD2BBD/01 fully supports In-Application Programming using ROM-resident Flash programming routines. These routines allow the running application to erase and reprogram Flash sectors without halting execution-enabling remote firmware updates over UART or other interfaces. The P89C51RD2BBD/01 implements dedicated SFRs (CCON, CMOD, CCAPMn) and security mechanisms to prevent accidental writes during IAP operations.
How many capture/compare channels does the PCA module in the P89C51RD2BBD/01 provide?
The P89C51RD2BBD/01 includes a five-channel Programmable Counter Array (PCA) with dedicated CEX0–CEX4 pins on Port 1. Each channel supports independent capture, compare, PWM, and software timer modes. The PCA operates synchronously with the system clock and can be configured for 6-clock or 12-clock timing via CKCON register bits PCAX2 and X2-providing precise timing control essential for motor control and pulse measurement applications.
What package type and pin count does the P89C51RD2BBD/01 use?
The P89C51RD2BBD/01 uses a 44-pin LQFP package (SOT389-1), measuring 10 mm × 10 mm with 0.8 mm lead pitch. It features four 8-bit I/O ports (P0–P3), plus dedicated function pins including RST, XTAL1/XTAL2, EA/VPP, ALE/PROG, PSEN, and WR/RD. This package is RoHS-compliant and optimized for surface-mount assembly in space-constrained industrial PCBs.
Can the P89C51RD2BBD/01 operate from a 3.3 V supply?
No, the P89C51RD2BBD/01 is specified for 4.5 V to 5.5 V operation only. Its internal regulator, Flash programming circuitry, and I/O buffer design require minimum 4.5 V for reliable functionality across temperature and process corners. Attempting 3.3 V operation may result in undefined behavior, failed ISP/IAP sequences, or incomplete resets. For 3.3 V systems, consider level-shifting interfaces or alternative microcontrollers rated for 3.3 V operation.
P89C51RD2BBD/01,55 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LQFP
- Series:
- 89C
- Packaging:
- Bag
- 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:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1K 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:
P89C51RD2BBD/01,55 FAQ
1.How can I place an order for P89C51RD2BBD/01,55 through Aetrix?
Please submit a Request for Quotation (RFQ) for P89C51RD2BBD/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 P89C51RD2BBD/01,55 reliable?
The price and inventory of P89C51RD2BBD/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 P89C51RD2BBD/01,55 is usually 5 days.
3.What payment methods are accepted for P89C51RD2BBD/01,55?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P89C51RD2BBD/01,55 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P89C51RD2BBD/01,55?
P89C51RD2BBD/01,55 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P89C51RD2BBD/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 P89C51RD2BBD/01,55?
For technical support, including P89C51RD2BBD/01,55 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P89C51RD2BBD/01,55 requirements.
6.How does Aetrix verify that P89C51RD2BBD/01,55 is sourced from the original manufacturer or authorized distributors?
All P89C51RD2BBD/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 P89C51RD2BBD/01,55 meets industry standards.
7.What is the process for return or replacement of P89C51RD2BBD/01,55?
All P89C51RD2BBD/01,55 units undergo pre-shipment inspection (PSI). If there is an issue with P89C51RD2BBD/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 P89C51RD2BBD/01,55 part is unused and in its original packaging.
Return procedure for P89C51RD2BBD/01,55:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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