Technical Summary: DS80C320/DS80C323 High-Speed Microcontroller

Overview

The DS80C320 and DS80C323 are high-performance microcontrollers from the 8051 family, offering enhanced speed and power efficiency while maintaining full compatibility with the standard 80C31/80C32 architecture. These devices are designed for applications requiring fast execution times and low power consumption while leveraging the familiar 8051 instruction set and peripheral set.

Key improvements over standard 8051 implementations include a four-clock machine cycle (versus twelve in standard 8051), dual data pointers for more efficient memory operations, and optional variable-length MOVX instructions for flexible external memory access. These features make the DS80C320/DS80C323 ideal for upgrading existing 8051-based designs or developing new high-performance embedded systems.

Features

Core Architecture

• Fully compatible with 80C31/80C32 instruction set and pinout
• Four 8-bit bidirectional I/O ports (Ports 0-3)
• Three 16-bit timer/counters (Timer 0, Timer 1, and Timer 2)
• 256 bytes of internal scratchpad RAM
• 64KB program memory (ROM) address space
• 64KB data memory (RAM) address space

Performance Enhancements

• 4-clock machine cycle architecture (vs. 12-clock in standard 8051)
• Maximum operating frequency:
  • DS80C320: DC to 33 MHz
  • DS80C323: DC to 18 MHz
• Single-cycle instruction execution in 121 ns (at 33 MHz)
• Dual data pointers for improved memory access efficiency
• Optional variable-length MOVX instruction for flexible external memory access

Power Management

• Reduced power consumption compared to standard 8051 at equivalent performance
• Power-saving modes:
  • Idle mode
  • Power-down mode

Applications

The DS80C320/DS80C323 microcontrollers are suitable for a wide range of embedded applications requiring high performance and 8051 compatibility, including:

• Industrial control systems
• Automotive electronics
• Telecommunications equipment
• Networking devices
• Medical instrumentation
• Consumer electronics
• Point-of-sale terminals
• Security systems
• Legacy system upgrades

These devices are particularly valuable in applications where existing 8051 code needs to be maintained while improving performance or reducing power consumption.

Electrical Characteristics

Absolute Maximum Ratings

• Supply voltage (Vcc): -0.5V to +7.0V
• Input voltage on any pin: -0.5V to Vcc +0.5V
• Operating temperature range:
  • Commercial: 0°C to +70°C
  • Industrial: -40°C to +85°C
• Storage temperature range: -65°C to +150°C

Recommended Operating Conditions

• Supply voltage (Vcc): 4.5V to 5.5V
• Operating frequency:
  • DS80C320: DC to 33 MHz
  • DS80C323: DC to 18 MHz
• Input high voltage (VIH): 2.0V min (at Vcc = 4.5V)
• Input low voltage (VIL): 0.8V max (at Vcc = 4.5V)

Power Consumption

• Active mode current (typical at 12 MHz): 15 mA
• Idle mode current (typical at 12 MHz): 5 mA
• Power-down mode current (typical): 50 μA

Package Information

Available Packages

• 40-pin Plastic Dual In-line Package (PDIP)
• 44-pin Plastic Leaded Chip Carrier (PLCC)
• 44-pin Thin Quad Flat Pack (TQFP)

Pin Configuration (40-pin PDIP)

• Port 0 (P0.0-P0.7): Pins 32-39
• Port 1 (P1.0-P1.7): Pins 1-8
• Port 2 (P2.0-P2.7): Pins 21-28
• Port 3 (P3.0-P3.7): Pins 10-17
• Power (Vcc): Pin 40
• Ground (GND): Pin 20
• Reset (RST): Pin 9
• Address Latch Enable (ALE): Pin 30
• Program Store Enable (PSEN): Pin 29
• External Access (EA): Pin 31
• Serial Port (TXD, RXD): Pins 11, 10
• Timer/Counter Inputs (T0, T1): Pins 14, 15

Development Support

The DS80C320/DS80C323 is supported by a wide range of development tools due to its 8051 compatibility:

• Standard 8051 assemblers and compilers
• In-circuit emulators supporting high-speed operation
• Flash-based evaluation boards
• JTAG debugging interfaces (on some package variants)
• Third-party IDE support (Keil, IAR, etc.)

Conclusion

The DS80C320/DS80C323 microcontrollers provide a significant performance upgrade over standard 8051 devices while maintaining full compatibility with existing 8051 code and hardware designs. With their four-clock machine cycle architecture, dual data pointers, and flexible memory access options, these devices offer embedded system designers a powerful upgrade path for legacy 8051 applications or a high-performance starting point for new designs. The availability in multiple package options and wide operating temperature ranges makes these microcontrollers suitable for a variety of commercial and industrial applications.