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NXP Semiconductors P89C51RD2BA/01,512
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- Part No.:
- P89C51RD2BA/01,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P89C51RD2BA/01,512.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,980
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Product details
Overview
P89C51RD2BA/01 from NXP Semiconductors (formerly Philips) is an 8-bit 80C51-compatible Flash microcontroller with 64 KB in-system and in-application programmable Flash memory, 1 KB RAM, four 8-bit I/O ports, three 16-bit timers, enhanced UART with framing error detection and automatic address recognition, and a 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) or 33 MHz in 12-clock mode, targeting embedded motor control and industrial automation systems.
For engineers reviewing the P89C51RD2BA/01 datasheet, P89C51RD2BA/01 pinout, P89C51RD2BA/01 application, or P89C51RD2BA/01 equivalent, key selection criteria include ISP/IAP Flash configurability, 6-/12-clock mode runtime switching via CKCON.X2, PCA-based PWM generation, 4-level nested interrupt support, and PLCC-44 package compatibility with legacy 80C51 toolchains.
Technical Context
The P89C51RD2BA/01 implements a static CMOS 80C51 core with full instruction set compatibility and extends it with dual clock modes: CPU clock configurable via Flash bit FX2 or SFR bit X2 (CKCON.0), while peripherals (PCA, timers, UART) independently select fosc/6 or fosc/12 using dedicated CKCON bits (PCAX2, T0X2, SIX2, etc.) - only active when CPU is in 6-clock mode. This enables fine-grained power/performance tuning without hardware changes.
Its enhanced UART supports modes 0–3 with framing error detection and automatic address recognition; the PCA provides five independent modules (CEX0–CEX4) for PWM, input capture, and software-timed event generation; and the watchdog timer (WD) and power control registers (PCON) support idle, power-down, and stop-clock modes with VCC monitoring down to 2 V and Power-On Flag (POF) retention.
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 boot ROM loader enabling UART-based firmware updates without external programmer |
| RAM | 1024-byte on-chip data RAM, expandable externally to 64 KB via MOVX @DPTR addressing |
| Clock Modes | Configurable 6-clock (20 MHz max) or 12-clock (33 MHz max) CPU operation; peripherals independently selectable between fosc/6 and fosc/12 |
| I/O & Peripherals | 32-bit I/O (4×8-bit ports), 3×16-bit timers, full-duplex enhanced UART, 5-channel PCA with PWM/capture/compare, watchdog timer |
| Interrupt System | Seven interrupt sources with four priority levels and two external interrupts (INT0/INT1) supporting level-sensitive wake-up from power-down |
| Package | PLCC-44 (SOT187-2), leaded chip carrier with 44 pins, 1.27 mm pitch, RoHS-compliant per preliminary data |
Pinout & Package
Package: Plastic Leaded Chip Carrier (PLCC), 44-pin, SOT187-2 footprint, compatible with standard PLCC-44 sockets and reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 (AD0–AD7) | Multiplexed address/data bus | Open-drain bidirectional port; emits low-order address and data during external memory access; requires external pull-ups for reliable high-impedance input |
| P1.0–P1.7 | General-purpose I/O with PCA/timer functions | Includes T2 (P1.0), T2EX (P1.1), ECI (P1.2), CEX0–CEX4 (P1.3–P1.7); all support internal pull-ups and PCA capture/compare/PWM routing |
| P2.0–P2.7 (A8–A15) | High-order address bus / I/O | Bidirectional port with internal pull-ups; outputs upper address byte during 16-bit external memory access (MOVX @DPTR) |
| P3.0–P3.7 | Secondary function I/O | RxD/TxD (UART), INT0/INT1 (level-sensitive interrupts), T0/T1 (timer inputs), WR/RD (external memory strobes) |
| RST | Reset input | Active-high asynchronous reset requiring ≥2 machine cycles (12/24 oscillator periods); supports power-on reset with RC network |
| XTAL1/XTAL2 | Crystal oscillator interface | Inverting amplifier inputs; supports crystal (1–20 MHz) or external clock source on XTAL1 with XTAL2 unconnected |
| EA/VPP | External access enable / programming voltage | High = execute from internal Flash; low = fetch from external program memory; also receives VPP during Flash programming |
| ALE/PROG | Address latch enable | Output pulse for latching P0 address bits; can be disabled via AUXR.0 to reduce EMI; active only during MOVX instructions when disabled |
Key Features
| Feature | Design Value |
|---|---|
| In-System Programming (ISP) | Enables field firmware updates via UART using built-in ROM bootloader - no external programmer required |
| In-Application Programming (IAP) | Allows runtime Flash reprogramming by user code using ROM-resident routines, enabling remote modem-based updates |
| Runtime Clock Mode Switching | CKCON.X2 bit toggles CPU between 6- and 12-clock modes "on-the-fly", adjusting performance and power without reset |
| Peripheral Clock Independence | Each peripheral (PCA, timers, UART) selects fosc/6 or fosc/12 individually via CKCON bits - critical for mixed-speed real-time tasks |
| Programmable Counter Array (PCA) | Five independent channels (CEX0–CEX4) support simultaneous PWM generation, input capture, and software timing with auto-reload |
| Low-Power Operation | Three power modes: Idle (CPU halted, peripherals active), Power-Down (oscillator stopped, RAM retained down to 2 V), Stop-Clock (0 MHz clock) |
Applications
| Motor Control System | Industrial PLC I/O Module |
|---|---|
Use Scenario: Closed-loop DC motor speed regulation using analog feedback and PWM drive signals. IC Role / Device Role / Timing Role: Primary controller executing PID algorithm, generating variable-duty-cycle PWM via PCA channels CEX0–CEX2, and sampling ADC (external) via GPIO-triggered capture. Use Value: 6-clock mode delivers 40 MHz-equivalent throughput for real-time loop execution; PCA's independent channel timing eliminates jitter in multi-motor synchronization. |
Use Scenario: DIN-rail mounted digital I/O expansion unit with isolated inputs/outputs and Modbus RTU communication. IC Role / Device Role / Timing Role: Protocol handler and I/O scheduler managing RS-485 UART framing, input debouncing via timer interrupts, and output state latching via Port 0/2. Use Value: Enhanced UART with automatic address recognition reduces host polling overhead; four interrupt priority levels ensure timely response to emergency stop signals. |
| Legacy Equipment Retrofit | Embedded Data Logger |
Use Scenario: Drop-in replacement for obsolete 87C51 OTP microcontrollers in aging test equipment with minimal PCB modification. IC Role / Device Role / Timing Role: Pin-compatible 80C51 derivative executing legacy assembly firmware, leveraging identical SFR map and instruction timing in 12-clock mode. Use Value: Full 80C51 instruction compatibility and identical PLCC-44 pinout (SOT187-2) enable direct socket replacement; ISP eliminates need for UV eraser. |
Use Scenario: Battery-powered environmental sensor node logging temperature/humidity to SPI Flash every 10 seconds. IC Role / Device Role / Timing Role: Low-power coordinator entering Power-Down mode between samples, waking via Timer 2 interrupt, and transferring data via UART to host. Use Value: Power-Down mode draws <10 µA typical; internal RAM retains log buffer across wake cycles; programmable clock-out (P1.0) drives external sensor sync signal. |
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 | Atmel 8051 core with 64 KB Flash, 2 KB RAM, USB interface, and higher 40 MHz max frequency; lacks PCA but adds USB PHY and bootloader | Requires USB host integration; not suitable for pure UART/RS-485 systems without protocol translation | Select when native USB device connectivity is required and board layout allows QFN-44 package |
| STC89C52RC-PD | Enhanced 8051 with 8 KB Flash, 512 B RAM, single-cycle execution, and integrated MAX232-level UART drivers; lower Flash density and no PCA | Optimized for cost-sensitive serial gateway designs; insufficient Flash/RAM for complex motor control firmware | Select for simple UART-to-GPIO bridges where PCA and large Flash are unnecessary |
Compared with AT89C51ED2-RLTUM and STC89C52RC-PD, the P89C51RD2BA/01 uniquely balances 64 KB ISP/IAP Flash, PCA-based PWM, and PLCC-44 legacy compatibility - making it optimal for retrofitting industrial controllers where peripheral flexibility and socket replacement matter more than USB or single-cycle speed.
Availability
P89C51RD2BA/01 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC I/O modules, legacy equipment retrofits, and embedded data loggers requiring stable component supply and long-term obsolescence management.
Supply support for P89C51RD2BA/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 (originally Philips Semiconductors) is a global leader in high-performance mixed-signal ICs, with expertise in automotive, industrial, and secure identification solutions.
The P89C51RD2BA/01 belongs to the P89C51Rx2xx Flash microcontroller family, designed specifically to extend the 80C51 architecture with ISP/IAP, flexible clocking, and enhanced peripherals for industrial automation and motor control applications.
FAQ
What is the maximum operating frequency of the P89C51RD2BA/01 in 6-clock mode?
The P89C51RD2BA/01 supports up to 20 MHz oscillator frequency in 6-clock mode, delivering 40 MHz equivalent performance (2 instructions per µs). This is confirmed in the Selection Table and OSCILLATOR CHARACTERISTICS section of the preliminary datasheet, with timing validated across 0–70°C and 4.5–5.5 V operation.
Does the P89C51RD2BA/01 support in-application programming (IAP) of its Flash memory?
Yes, the P89C51RD2BA/01 supports IAP using ROM-resident low-level Flash programming routines. User firmware can erase and reprogram Flash sectors while executing from other Flash regions - enabling remote firmware updates over UART or modem links without halting system operation.
What package type and pin count does the P89C51RD2BA/01 use?
The P89C51RD2BA/01 uses a 44-pin Plastic Leaded Chip Carrier (PLCC) package, designated SOT187-2. Its pinout matches standard PLCC-44 footprints and is fully documented in the PINNING and PIN DESCRIPTIONS sections, including NC pins at positions 1, 12, 23, and 34.
How many priority levels does the interrupt structure of the P89C51RD2BA/01 support?
The P89C51RD2BA/01 features a four-priority-level, nested interrupt structure with seven interrupt sources: two external (INT0, INT1), three timer (TF0, TF1, TF2), one serial (RI/TI), and one PCA (CCF0–CCF4). Priority is configured via IP and IPH SFRs, enabling deterministic real-time response in motor control loops.
Can the P89C51RD2BA/01 generate PWM signals without external components?
Yes, the P89C51RD2BA/01 integrates a Programmable Counter Array (PCA) with five independent channels (CEX0–CEX4) that support hardware PWM generation. Each channel can be configured for edge-aligned or center-aligned PWM with programmable period and duty cycle using RCAP2H/L and CCAPMn registers - no external timers or logic required.
P89C51RD2BA/01,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- 89C
- Packaging:
- Tube
- 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:
P89C51RD2BA/01,512 FAQ
1.How can I place an order for P89C51RD2BA/01,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P89C51RD2BA/01,512 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 P89C51RD2BA/01,512 reliable?
The price and inventory of P89C51RD2BA/01,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P89C51RD2BA/01,512 is usually 5 days.
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Once your P89C51RD2BA/01,512 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 P89C51RD2BA/01,512?
For technical support, including P89C51RD2BA/01,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P89C51RD2BA/01,512 requirements.
6.How does Aetrix verify that P89C51RD2BA/01,512 is sourced from the original manufacturer or authorized distributors?
All P89C51RD2BA/01,512 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 P89C51RD2BA/01,512 meets industry standards.
7.What is the process for return or replacement of P89C51RD2BA/01,512?
All P89C51RD2BA/01,512 units undergo pre-shipment inspection (PSI). If there is an issue with P89C51RD2BA/01,512, 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 P89C51RD2BA/01,512 part is unused and in its original packaging.
Return procedure for P89C51RD2BA/01,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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