Philips 80C51 87C51 80C31 User Manual

Summary

Discover the high-performance 8XC51/31 family of 8-bit microcontrollers. These low voltage, low power devices offer advanced embedded processing capabilities up to 33 MHz, featuring integrated ROM and RAM, robust timers, and enhanced serial communication. This manual provides comprehensive technical specifications on operation across 2.7V–5.5V, detailing all packaging options, memory configurations, and advanced power management modes (e.g., Idle mode). Ideal for engineers and hardware designers building demanding embedded systems requiring reliable, high-speed control solutions.

Navigation
- Table of Contents
- Selection Guide
- Help
- Search
- Print
List of Figures
- Figure 1. Timer/Counter 2 (T2CON) Control Register
- Figure 2. Timer 2 in Capture Mode
- Figure 3. Timer 2 Mode (T2MOD) Control Register
- Figure 4. Timer 2 in Auto-Reload Mode (DCEN = 0)
- Figure 5. Timer 2 Auto Reload Mode (DCEN = 1)
- Figure 6. Timer 2 in Baud Rate Generator Mode
- Figure 7. SCON: Serial Port Control Register
- Figure 8. UART Framing Error Detection
- Figure 9. UART Multiprocessor Communication, Automatic Address Recognition
- Figure 10. IE Registers
- Figure 11. IP Registers
- Figure 12. IPH Registers
- Figure 13.
- Figure 14. External Program Memory Read Cycle
- Figure 15. External Data Memory Read Cycle
- Figure 16. External Data Memory Write Cycle
- Figure 17. Shift Register Mode Timing
- Figure 18. External Clock Drive
- Figure 19. AC Testing Input/Output
- Figure 20. Float Waveform
- Figure 21. I CC vs. FREQ
- Figure 22. I CC Test Condition, Active Mode
- Figure 23. I CC Test Condition,
- Figure 24. Clock Signal Waveform for I CC Tests in Active and Idle Modes t CLCH = t CHCL = 5ns
- Figure 25. I CC Test Condition, Power Down Mode
- Figure 26. Programming Configuration
- Figure 27. PROG Waveform
- Figure 28. Program Verification
- Figure 29. EPROM Programming and Verification
List of Tables
- Table 1. 8XC51/80C31 Special Function Registers
- Table 2. External Pin Status During Idle and Power-Down Modes
- Table 3. Timer 2 Operating Modes
- Table 4. Timer 2 Generated Commonly Used Baud Rates
- Table 5. Timer 2 as a Timer
- Table 6. Timer 2 as a Counter
- Table 7. Interrupt Table
- Table 8. EPROM Programming Modes
- Table 9. Program Security Bits for EPROM Devices
- Table 10. Program Security Bits
80C51/87C51/80C31 80C51 8-bit microcontroller family
- Description
- Selection Table
- Features
- 80C51/87C51 and 80C31 Ordering Information
- 80C51/87C51 and 80C31 Ordering Information
- Block Diagram
- Logic Symbol
- Pin Configurations
- Plastic Leaded Chip Carrier Pin Functions
- Plastic Quad Flat Pack Pin Functions
- Pin Descriptions
- Oscillator Characteristics
  - Reset
  - Stop Clock Mode
  - Idle Mode
  - Power-Down Mode
  - LPEP
  - Design Consideration
  - ONCE Mode
  - Programmable Clock-Out
- Timer 2 Operation
  - Timer 2
  - Capture Mode
  - Auto-Reload Mode (Up or Down Counter)
  - Baud Rate Generator Mode
  - Summary Of Baud Rate Equations
  - Timer/Counter 2 Set-up
  - Enhanced UART
    
    Automatic Address Recognition
  - Interrupt Priority Structure
  - Reduced EMI Mode
    
    AUXR (8EH)
  - Dual DPTR
    
    AUXR1 (A2H)
    
    DPTR Instructions
- Absolute Maximum Ratings
- AC Electrical Characteristics
- DC Electrical Characteristics
- DC Electrical Characteristics
- AC Electrical Characteristics
- AC Electrical Characteristics
- Explanation of the AC Symbols
- EPROM Characteristics
  - Quick-Pulse Programming
    
    Program Verification
    
    Reading the Signature Bytes
  - Program/Verify Algorithms
  - Erasure Characteristics
  - Security Bits
  - Encryption Array
- EPROM Programming and Verification Characteristics
- Mask ROM Devices
  - Security Bits
  - Encryption Array
- ROM Code Submission
- DIP40: plastic dual in-line package; 40 leads (600 mil)
- PLCC44: plastic leaded chip carrier; 44 leads
- QFP44: plastic quad flat package; 44 leads (lead length 1.3 mm); body 10 x 10 x 1.75 mm
- Data sheet status

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Page 1 Text Content

INTEGRATED CIRCUITS

80C51/87C51/80C31 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless low voltage (2.7V–5.5V), low power, high speed (33 MHz)

Product specification 2000 Jan 20 Supersedes data of 1999 Apr 01 IC28 Data Handbook

Page Summary Contents For Philips 80C51 87C51 80C31 User Manual

Page 1 INTEGRATED CIRCUITS 80C51/87C51/80C31 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless low voltage (2.7V–5.5V), low power, high speed (33 MHz) Product specification 2000 Jan 20 Supersedes dat...

Page 2 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) DESCRIPTION FEATURES T...

Page 3 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) 80C51/87C51 AND 80C31 ...

Page 4 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) BLOCK DIAGRAM IN IO IS...

Page 5 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) LOGIC SYMBOL PLASTIC L...

Page 6 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) PIN DESCRIPTIONS PIN N...

Page 7 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) Table 1. 8XC51/80C31 S...

Page 8 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) OSCILLATOR CHARACTERIS...

Page 9 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) Programmable Clock-Out...

Page 10 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) (MSB) (LSB) TF2 EXF2 R...

Page 11 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) T2MOD Address = 0C9H R...

Page 12 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) (DOWN COUNTING RELOAD ...

Page 13 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) Baud Rate Generator Mo...

Page 14 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) Table 5. Timer 2 as a ...

Page 15 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) and 1 and exclude Slav...

Page 16 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) START DATA BYTE ONLY I...

Page 17 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) Interrupt Priority Str...

Page 18 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) PT0PX1PT1PSPT2—— PX0IP...

Page 19 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) Reduced EMI Mode Note ...

Page 20 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) ABSOLUTE MAXIMUM RATIN...

Page 21 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) DC ELECTRICAL CHARACTE...

Page 22 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) DC ELECTRICAL CHARACTE...

Page 23 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) AC ELECTRICAL CHARACTE...

Page 24 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) AC ELECTRICAL CHARACTE...

Page 25 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) EXPLANATION OF THE AC ...

Page 26 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) t WHLH t LLWL t WLWH t...

Page 27 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) VCC–0.5 VLOAD+0.1V TIM...

Page 28 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) VCC VCC ICC ICC VCC VC...

Page 29 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) EPROM CHARACTERISTICS ...

Page 30 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) Table 8. EPROM Program...

Page 31 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) P0 PGM DATA EA/VPP +12...

Page 32 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) EPROM PROGRAMMING AND ...

Page 33 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) MASK ROM DEVICES Secur...

Page 34 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) DIP40: plastic dual in...

Page 35 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) PLCC44: plastic leaded...

Page 36 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) QFP44: plastic quad fl...

Page 37 Philips Semiconductors Product specification 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V), 80C51/87C51/80C31 low power, high speed (33 MHz) Data sheet status Data...

Manual Details

Brand	Philips
Pages	37
File Size	363.58 KB
Published	July 10, 2026

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Frequently Asked Questions

What is the operating voltage range for this microcontroller?

It operates at low voltages ranging from 2.7V up to 5.5V.

How can power consumption be reduced when the device is inactive?

Two modes are available: Idle mode or Power-down mode, allowing core functions to continue running while saving energy.

What key memory and peripheral components does this chip contain?

It includes 4k × 8 ROM, 128 × 8 RAM, three sixteen-bit timers, and a serial I/O port.

Is the device suitable for use in life support systems?

No, the products are not designed for use in life support appliances or critical life support systems.

Philips 80C51 87C51 80C31 User Manual

Summary

Reset

Stop Clock Mode

Idle Mode

Power-Down Mode

LPEP

Design Consideration

ONCE Mode

Programmable Clock-Out

Timer 2

Capture Mode

Auto-Reload Mode (Up or Down Counter)

Baud Rate Generator Mode

Summary Of Baud Rate Equations

Timer/Counter 2 Set-up

Enhanced UART

Automatic Address Recognition

Interrupt Priority Structure

Reduced EMI Mode

AUXR (8EH)

Dual DPTR

AUXR1 (A2H)

DPTR Instructions

Quick-Pulse Programming

Program Verification

Reading the Signature Bytes

Program/Verify Algorithms

Erasure Characteristics

Security Bits

Encryption Array

Security Bits

Encryption Array

Navigation

Table of Contents

Selection Guide

Help

Search

Print

List of Figures

Figure 1. Timer/Counter 2 (T2CON) Control Register

Figure 2. Timer 2 in Capture Mode

Figure 3. Timer 2 Mode (T2MOD) Control Register

Figure 4. Timer 2 in Auto-Reload Mode (DCEN = 0)

Figure 5. Timer 2 Auto Reload Mode (DCEN = 1)

Figure 6. Timer 2 in Baud Rate Generator Mode

Figure 7. SCON: Serial Port Control Register

Figure 8. UART Framing Error Detection

Figure 9. UART Multiprocessor Communication, Automatic Address Recognition

Figure 10. IE Registers

Figure 11. IP Registers

Figure 12. IPH Registers

Figure 13.

Figure 14. External Program Memory Read Cycle

Figure 15. External Data Memory Read Cycle

Figure 16. External Data Memory Write Cycle

Figure 17. Shift Register Mode Timing

Figure 18. External Clock Drive

Figure 19. AC Testing Input/Output

Figure 20. Float Waveform

Figure 21. I CC vs. FREQ

Figure 22. I CC Test Condition, Active Mode

Figure 23. I CC Test Condition,

Figure 24. Clock Signal Waveform for I CC Tests in Active and Idle Modes t CLCH = t CHCL = 5ns

Figure 25. I CC Test Condition, Power Down Mode

Figure 26. Programming Configuration

Figure 27. PROG Waveform

Figure 28. Program Verification

Figure 29. EPROM Programming and Verification

List of Tables

Table 1. 8XC51/80C31 Special Function Registers

Table 2. External Pin Status During Idle and Power-Down Modes

Table 3. Timer 2 Operating Modes