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NXP Semiconductors P87C51RC+4N,112
- Part No.:
- P87C51RC+4N,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
P87C51RC+4N,112.pdf
- Description:
- IC MCU 8BIT 32KB OTP 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,344
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Product details
Overview
P87C51RC+4N,112 from NXP Semiconductors (formerly Philips) is an 8-bit OTP microcontroller based on the enhanced 80C51 architecture, featuring 32KB on-chip OTP program memory, 512 bytes of RAM, hardware watchdog timer, and programmable counter array (PCA) with five capture/compare modules. It operates from 2.7 V to 5.5 V at up to 16 MHz and targets embedded control in industrial automation and motor drive systems.
For engineers reviewing the P87C51RC+4N,112 datasheet, P87C51RC+4N,112 pinout, P87C51RC+4N,112 application, or P87C51RC+4N,112 equivalent, key selection criteria include OTP security bit configuration, PCA-based PWM timing resolution, dual DPTR support for external memory access, and compatibility with legacy 80C51 toolchains and interrupt structure.
Technical Context
This device belongs to the 8XC51RA+/RB+/RC+/RD+ family - a derivative of the 80C51 core with architectural enhancements including a hardware watchdog timer, PCA module supporting edge-triggered capture and software-timed compare, and full-duplex UART with framing error detection and automatic address recognition.
It supports four priority-level nested interrupts, three 16-bit timers (T0/T1/T2), and extended SFRs for PCA control (CCON, CCAPMn, CL/CH). The PCA enables precise pulse-width modulation and high-speed I/O event timing without CPU intervention, making it suitable for real-time motor control and sensor synchronization tasks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | Enhanced 80C51-compatible 8-bit CPU with full instruction set compatibility |
| Program Memory | 32 KB OTP - non-volatile, one-time programmable code storage with 3-bit security lock |
| RAM Size | 512 bytes internal RAM - double the capacity of base 80C51, enabling larger stack and data buffers |
| Max Clock Frequency | 16 MHz - supports standard crystal or external clock input via XTAL1/XTAL2 pins |
| Operating Voltage | 2.7 V to 5.5 V - wide supply range enables direct interface with 3.3 V and 5 V logic systems |
| Power Modes | Idle and Power-Down modes - reduces current consumption during standby; oscillator stops in Power-Down |
| Interrupt Sources | 7 sources with 4 priority levels - includes INT0/INT1, T0/T1/T2 overflows, serial receive/transmit, and PCA overflow |
Pinout & Package
Package: 40-pin Plastic Dual In-line Package (PDIP), SOT129-1 footprint, through-hole mountable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Port 0 bidirectional I/O / AD0–AD7 multiplexed bus | Open-drain port used for external memory addressing/data transfer; requires external pull-ups for bus operation |
| P1.0–P1.7 | Port 1 bidirectional I/O with alternate PCA functions | CEX0–CEX4 and T2/T2EX pins enable five independent capture/compare channels for PWM or timing measurement |
| P2.0–P2.7 | Port 2 bidirectional I/O / A8–A15 high-order address | Drives upper address byte during 16-bit external memory accesses; retains value in idle mode |
| P3.0–P3.7 | Port 3 bidirectional I/O with dedicated peripheral signals | Includes RxD/TxD (UART), INT0/INT1 (external interrupts), T0/T1 (timer inputs), WR/RD (memory strobes) |
| RST | Active-high reset input | Requires ≥2 machine cycles (24 oscillator periods) high pulse; internal weak pull-down ensures power-on reset with RC network |
| XTAL1/XTAL2 | Crystal oscillator input/output | Supports quartz crystal (1–16 MHz) or external CMOS clock source; no duty cycle requirement for external drive |
| EA/VPP | External access enable / programming voltage | Low = execute from external memory; high = execute from internal OTP; also accepts 12.75 V during programming |
| ALE/PROG | Address latch enable / programming pulse | Outputs 1/6 oscillator frequency for external address latching; doubles as EPROM programming pulse when PROG active |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Watchdog Timer | Enables autonomous system recovery from software hang without external components |
| Programmable Counter Array (PCA) | Five independent 16-bit modules support PWM generation, high-resolution input capture, and software timer extension |
| Enhanced UART | Framing error detection and automatic address recognition simplify multi-drop RS-485 network implementation |
| Dual Data Pointer (DPTR) | Allows simultaneous access to two external memory locations without register save/restore overhead |
| OTP Security Bits | Three programmable bits prevent unauthorized readout of firmware content after programming |
| Low-Voltage Operation | Functional down to 2.7 V enables battery-powered or mixed-voltage system integration |
Applications
| Industrial Motor Control | Smart Sensor Interface |
|---|---|
Use Scenario: Closed-loop speed regulation of BLDC motors using hall-effect feedback and six-step commutation. IC Role / Device Role / Timing Role: Primary controller executing commutation logic, generating synchronized PWM outputs via PCA modules, and managing UART-based host commands. Use Value: PCA's CEX0–CEX4 pins deliver jitter-free, phase-aligned PWM with sub-microsecond timing resolution - critical for torque ripple reduction. | Use Scenario: Multi-sensor node aggregating temperature, pressure, and humidity data for HVAC monitoring. IC Role / Device Role / Timing Role: Central acquisition engine reading analog sensors via external ADC, timestamping events using T2, and transmitting packets over RS-485. Use Value: Hardware watchdog ensures reliable long-term operation; dual DPTR accelerates burst reads from multiple sensor registers. |
| Energy Metering Front-End | Legacy Industrial PLC I/O Module |
Use Scenario: Pulse counting and tariff switching in electromechanical energy meters interfacing with reed switches and relay drivers. IC Role / Device Role / Timing Role: High-accuracy edge counter capturing kWh pulses via T0/T1; manages time-of-use scheduling using internal RTC emulation. Use Value: 16-bit timers with GATE control allow precise windowed counting; low-power idle mode extends battery life in backup operation. | Use Scenario: Discrete I/O expansion for DIN-rail mounted PLCs requiring deterministic scan-cycle timing and fieldbus communication. IC Role / Device Role / Timing Role: Dedicated I/O processor handling digital input debouncing, output latching, and Modbus RTU protocol stack execution. Use Value: Four 8-bit ports provide 32 configurable I/O lines; enhanced UART with framing error detection improves Modbus CRC reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| P87C51RB+4N,112 | 16 KB OTP, same package and pinout, identical peripheral set except reduced program memory | Suitable where firmware size < 16 KB and cost optimization is prioritized over future code growth headroom | Select when application firmware fits within 16 KB and BOM cost sensitivity outweighs memory scalability needs |
| P87C51RD+4N,112 | 64 KB OTP, same package and pinout, adds extra 16 KB RAM and expanded SFR space for larger applications | Required for complex control algorithms or integrated protocol stacks exceeding 32 KB code footprint | Choose when firmware complexity demands >32 KB code space or additional RAM for real-time buffering |
Compared with P87C51RC+4N,112, the RB+ variant offers lower memory cost but constrains firmware scalability, while the RD+ variant provides headroom for feature-rich firmware at higher unit cost and marginally increased power draw during active execution.
Availability
P87C51RC+4N,112 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor interface, energy metering front-end, and legacy PLC I/O module applications requiring stable component supply across extended product lifecycles.
Supply support for P87C51RC+4N,112 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 secure, scalable solutions for automotive, industrial, IoT, and communication infrastructure markets.
The 8XC51RA+/RB+/RC+/RD+ product line was designed specifically for cost-sensitive, high-reliability industrial control applications requiring OTP security, hardware watchdog protection, and enhanced timing peripherals beyond baseline 80C51 capabilities.
FAQ
What is the maximum operating frequency of the P87C51RC+4N,112?
The P87C51RC+4N,112 supports a maximum clock frequency of 16 MHz when operated within its specified voltage range of 2.7 V to 5.5 V. This is confirmed in the Philips product specification document dated August 2000, which lists the "4N" suffix as denoting the 0–16 MHz speed grade for the 40-pin PDIP package. Higher-frequency variants (e.g., "IN") are rated for 33 MHz but require 5 V supply only.
Does the P87C51RC+4N,112 include a hardware watchdog timer?
Yes, the P87C51RC+4N,112 includes a hardware watchdog timer as part of its enhanced 8XC51RA+ family features. This is explicitly documented in the memory/peripheral comparison table on page 2 of the datasheet, which distinguishes RA+/RB+/RC+/RD+ devices from earlier FA/FB/FC families by listing "Yes" under the Hardware Watch Dog Timer column. The WDTRST special function register (SFR) at address 0A6H further confirms its presence and software controllability.
How many capture/compare channels does the PCA module in the P87C51RC+4N,112 support?
The P87C51RC+4N,112 supports five independent capture/compare channels via its Programmable Counter Array (PCA) module - CEX0 through CEX4 - mapped to Port 1 pins P1.3 to P1.7 respectively. This is verified in the Pin Descriptions section (page 5) and Table 2 (page 11), which lists CCAPM0–CCAPM4 SFRs and corresponding port pin mnemonics. Each channel can be configured for PWM, high-speed input capture, or software timer extension.
What package type and pin count does the P87C51RC+4N,112 use?
The P87C51RC+4N,112 uses a 40-pin Plastic Dual In-line Package (PDIP), designated SOT129-1 in Philips' ordering information. This is confirmed in the "87C51RA+/RB+/RC+/RD+ AND 80C51RA+ ORDERING INFORMATION" table on page 9, where the "4N" suffix corresponds to the 0–70°C temperature grade in the 40-pin DIP variant. Pin compatibility with standard 80C51 sockets simplifies legacy board upgrades.
Is external memory expansion supported by the P87C51RC+4N,112?
Yes, the P87C51RC+4N,112 supports external memory expansion up to 64 KB using its multiplexed Port 0 (AD0–AD7) and Port 2 (A8–A15) buses, along with dedicated RD, WR, and PSEN control signals. The datasheet states that ROMless and OTP variants like P87C51RC+4N,112 "can address up to 64K of external memory," and the presence of EA/VPP pin functionality confirms external program memory access capability when EA is held low.
P87C51RC+4N,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- 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:
- 32KB (32K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 512 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:
- Through Hole
- Supplier Device Package:
P87C51RC+4N,112 FAQ
1.How can I place an order for P87C51RC+4N,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C51RC+4N,112 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 P87C51RC+4N,112 reliable?
The price and inventory of P87C51RC+4N,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C51RC+4N,112 is usually 5 days.
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P87C51RC+4N,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C51RC+4N,112 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 P87C51RC+4N,112?
For technical support, including P87C51RC+4N,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C51RC+4N,112 requirements.
6.How does Aetrix verify that P87C51RC+4N,112 is sourced from the original manufacturer or authorized distributors?
All P87C51RC+4N,112 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 P87C51RC+4N,112 meets industry standards.
7.What is the process for return or replacement of P87C51RC+4N,112?
All P87C51RC+4N,112 units undergo pre-shipment inspection (PSI). If there is an issue with P87C51RC+4N,112, 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 P87C51RC+4N,112 part is unused and in its original packaging.
Return procedure for P87C51RC+4N,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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