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NXP Semiconductors P87C51RD+4A,512
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- Part No.:
- P87C51RD+4A,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C51RD+4A,512.pdf
- Description:
- IC MCU 8BIT 64KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,082
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Product details
Overview
P87C51RD+4A,512 from Philips Semiconductors is an 8-bit Flash microcontroller in the 80C51 family, featuring 64 KB ISP/IAP 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 33 MHz in 12-clock mode and targets motor control, industrial automation, and embedded instrumentation.
For engineers reviewing the P87C51RD+4A,512 datasheet, P87C51RD+4A,512 pinout, P87C51RD+4A,512 application, or P87C51RD+4A,512 equivalent, key selection criteria include Flash reprogrammability via UART boot loader, 6-/12-clock mode runtime switching via CKCON.X2, peripheral clock independence in 6-clock CPU mode, PCA-based PWM resolution, and PDIP-40 package compatibility with legacy 80C51 layouts.
Technical Context
The P87C51RD+4A,512 implements a static CMOS 80C51-compatible CPU core with dual clock modes: default 12-clock mode (33 MHz max) and software-switchable 6-clock mode (20 MHz max, 40 MHz equivalent performance). Its Flash memory supports both In-System Programming (ISP) via UART using on-chip ROM boot loader and In-Application Programming (IAP) using ROM-resident routines.
Peripherals-including Timer 0/1/2, PCA, and UART-are individually configurable for 6- or 12-clock operation when the CPU runs in 6-clock mode, controlled by dedicated bits (T0X2–PCAX2) in CKCON (0x8F). The PCA provides five independent capture/compare modules (CEX0–CEX4) and hardware PWM generation without CPU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible 8-bit CPU with 100% instruction set compatibility |
| Flash Memory | 64 KB ISP/IAP Flash with security lock bit; enables field firmware updates and remote reprogramming |
| RAM | 1024-byte on-chip SRAM; expandable externally to 64 KB via MOVX instructions |
| Max Operating Frequency | 33 MHz at 12-clock mode (20 MHz at 6-clock mode); supports 0–33 MHz range at 5 V |
| I/O Ports | Four 8-bit bidirectional ports (P0–P3); P0/P2 serve as multiplexed AD0–AD7/A8–A15 during external memory access |
| Timers & Counters | Three 16-bit timers (T0/T1/T2); T2 supports baud-rate generation, clock-out, and capture/reload |
| UART | Full-duplex enhanced UART with framing error detection, automatic address recognition, and variable baud rate via T1/T2 |
| PCA | Programmable Counter Array with five CEX channels (CEX0–CEX4); supports PWM, edge capture, and software timer functions |
Pinout & Package
Package: 40-pin Plastic Dual In-Line Package (PDIP), SOT129-1, 0.6-inch width, through-hole mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 (pins 39–32) | Open-drain bidirectional I/O / AD0–AD7 | Multiplexed address/data bus for external memory; requires external pull-ups for reliable high-level input |
| P1.0–P1.7 (pins 1–8) | Bidirectional I/O with internal pull-ups | Includes PCA functions: T2, T2EX, ECI, CEX0–CEX4 - enables hardware PWM and event timing without CPU overhead |
| P2.0–P2.7 (pins 21–28) | Bidirectional I/O / A8–A15 | High-order address bus for 16-bit external memory access; emits P2 register value for 8-bit MOVX @Ri |
| P3.0–P3.7 (pins 10–17) | Bidirectional I/O with alternate functions | RxD/TxD (serial comms), INT0/INT1 (level-sensitive interrupts), T0/T1 (timer inputs), WR/RD (external memory strobes) |
| RST (pin 9) | Active-high reset input | Requires ≥2 machine cycles (24 clocks @12-clk mode) high pulse; enables asynchronous port reset and power-on flag (POF) detection |
| XTAL1/XTAL2 (pins 15/14) | Oscillator input/output | Supports crystal (1–33 MHz) or external clock source; XTAL2 unconnected when external clock applied to XTAL1 |
| EA/VPP (pin 29) | External access enable / programming voltage | High = execute from internal Flash; low = fetch from external program memory; also receives VPP during Flash programming |
| ALE/PROG (pin 30) | Address latch enable / programming pulse | Outputs two pulses per machine cycle for external latch control; disabled via AUXR.0 to reduce EMI |
Key Features
| Feature | Design Value |
|---|---|
| In-System Programming (ISP) | Serial Flash programming via UART using factory-loaded ROM boot loader - no external programmer required for field updates |
| In-Application Programming (IAP) | Runtime Flash reprogramming using ROM-resident routines - enables over-the-air firmware patches and dynamic configuration |
| 6-/12-Clock Mode Flexibility | CPU clock mode selectable via Flash bit (FX2) or SFR bit (CKCON.X2); allows performance/power trade-off without hardware change |
| Independent Peripheral Clocking | When CPU runs in 6-clock mode, each peripheral (PCA, UART, T0–T2) can be independently set to 6- or 12-clock timing - optimizes latency vs. power |
| Programmable Clock-Out | 50% duty cycle clock output on P1.0 (T2) ranging 61 Hz–8 MHz - usable for system synchronization or driving external logic |
| Low-EMI Operation | ALE inhibition via AUXR.0 reduces electromagnetic emissions - simplifies compliance testing in noise-sensitive industrial environments |
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: Primary controller executing PID loop, generating PWM signals via PCA modules CEX0–CEX4, and sampling analog feedback via external ADC interface. Use Value: Hardware PWM with <1 µs jitter and independent channel dead-time insertion eliminates CPU polling overhead and ensures precise phase alignment. | Use Scenario: Standalone logic controller handling discrete I/O, serial HMI communication, and watchdog-monitored safety interlocks. IC Role / Device Role / Timing Role: Central processing unit managing scan-cycle execution, UART-based Modbus RTU protocol, and hardware reset supervision via WDT and RST pin monitoring. Use Value: Full-duplex UART with automatic address recognition enables multi-drop RS-485 networks without software address filtering overhead. |
| Embedded Data Logger | Legacy Equipment Interface Adapter |
Use Scenario: Battery-powered sensor node logging temperature, humidity, and vibration data to SPI Flash or SD card. IC Role / Device Role / Timing Role: Host MCU coordinating low-power sleep cycles (Idle/Power-down), wake-up triggers (INT0/INT1), and burst-mode data transfers via MOVX. Use Value: Power-down mode retains RAM and SFRs down to 2 V while stopping oscillator - extends battery life without data loss or full reinitialization. | Use Scenario: Protocol translator bridging RS-232 serial devices to modern CAN or USB interfaces using minimal external components. IC Role / Device Role / Timing Role: Firmware-defined protocol engine implementing byte-level framing, parity checking, and buffer management between UART and external transceivers. Use Value: Second DPTR register and 1 KB RAM support dual-buffered DMA-like transfers - prevents UART overrun during high-speed legacy device handshaking. |
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 |
|---|---|---|---|
| P89C51RD2BN/01 | Same core, identical 64 KB Flash/1 KB RAM, PDIP-40 package, and pinout; manufactured later with updated Flash algorithm and 6-clock default mode | No functional difference in motor control or serial gateway use; supports same ISP/IAP flow and CKCON peripheral clocking | Select P89C51RD2BN/01 for new designs requiring documented 6-clock default behavior and compatibility with newer Philips programming tools |
| AT89C51ED2-RL24 | Atmel derivative with 64 KB Flash, 1 KB RAM, and enhanced UART; lacks PCA but adds SPI interface and brown-out detection | Suitable for UART-centric applications where SPI peripheral expansion is needed, but not for PCA-dependent PWM timing | Choose AT89C51ED2-RL24 when SPI connectivity or built-in BOD is required, accepting absence of hardware capture/compare channels |
Compared with P87C51RD+4A,512, P89C51RD2BN/01 offers identical functionality with improved Flash programming reliability, while AT89C51ED2-RL24 trades PCA capability for SPI and BOD - making the former a drop-in upgrade and the latter a functional alternative only where PCA is unused.
Availability
P87C51RD+4A,512 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC modules, embedded data loggers, and legacy equipment interface adapters requiring stable component supply and long-term obsolescence management.
Supply support for P87C51RD+4A,512 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
Philips Semiconductors (now NXP Semiconductors) is a global semiconductor innovator founded in the Netherlands, specializing in mixed-signal ICs, microcontrollers, and automotive electronics.
The P87C51RD+4A,512 belongs to the P89C51Rx2xx Flash microcontroller product line, designed specifically for cost-sensitive, high-reliability industrial control applications requiring field-upgradable firmware and deterministic real-time peripheral response.
FAQ
What is the maximum operating frequency of the P87C51RD+4A,512 and how does clock mode affect it?
The P87C51RD+4A,512 supports up to 33 MHz in 12-clock mode and 20 MHz in 6-clock mode. In 6-clock mode, performance is equivalent to 40 MHz standard 80C51 operation. The clock mode is selected via Flash bit FX2 (default 12-clock) or SFR bit X2 in CKCON, and the CPU mode affects all peripherals unless overridden by individual CKCON peripheral bits (e.g., T0X2).
Does the P87C51RD+4A,512 support in-system programming without an external programmer?
Yes, the P87C51RD+4A,512 supports In-System Programming (ISP) via its UART using a factory-loaded boot loader in ROM. This allows Flash memory programming directly in the target system using only a serial connection and host PC software - no parallel programmer or socket adapter is required.
How many capture/compare channels does the PCA in the P87C51RD+4A,512 provide, and which pins are used?
The P87C51RD+4A,512 includes a Programmable Counter Array (PCA) with five independent capture/compare modules (CEX0–CEX4), mapped to P1.3–P1.7 respectively. Each channel supports PWM generation, edge-triggered capture, and software timer functions with hardware auto-reload - all without CPU intervention.
Can the P87C51RD+4A,512 operate in low-power modes, and what is retained during Power-down?
Yes, the P87C51RD+4A,512 supports Idle and Power-down modes. In Power-down mode, the oscillator stops and the device consumes minimal current. On-chip RAM and Special Function Registers retain their values down to 2 V supply, and exit is triggered by hardware reset or level-sensitive external interrupt (INT0/INT1).
Is the P87C51RD+4A,512 pin-compatible with standard 8051 microcontrollers in PDIP-40 packages?
Yes, the P87C51RD+4A,512 uses a standard 40-pin PDIP footprint (SOT129-1) and maintains full 80C51 instruction set and port pin compatibility. Port 0–3, RST, XTAL1/XTAL2, EA, PSEN, ALE, RD, and WR align with industry-standard 8051 layouts, enabling drop-in replacement in existing designs with no PCB changes.
P87C51RD+4A,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- 87C
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- Connectivity:
- EBI/EMI, UART/USART
- Peripherals:
- POR, PWM, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P87C51RD+4A,512 FAQ
1.How can I place an order for P87C51RD+4A,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C51RD+4A,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 P87C51RD+4A,512 reliable?
The price and inventory of P87C51RD+4A,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C51RD+4A,512 is usually 5 days.
3.What payment methods are accepted for P87C51RD+4A,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C51RD+4A,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C51RD+4A,512?
P87C51RD+4A,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C51RD+4A,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 P87C51RD+4A,512?
For technical support, including P87C51RD+4A,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C51RD+4A,512 requirements.
6.How does Aetrix verify that P87C51RD+4A,512 is sourced from the original manufacturer or authorized distributors?
All P87C51RD+4A,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 P87C51RD+4A,512 meets industry standards.
7.What is the process for return or replacement of P87C51RD+4A,512?
All P87C51RD+4A,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C51RD+4A,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 P87C51RD+4A,512 part is unused and in its original packaging.
Return procedure for P87C51RD+4A,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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