描述 Description

Overview Three different Single-Chip 8-Bit Microcontroller families are presented in this datasheet:
8XC54/8XC58
80C51FA/8XC51FA/8XC51FB/8XC51FC
80C51RA+/8XC51RA+/8XC51RB+/8XC51RC+/8XC51RD+
For applications requiring 4K ROM/EPROM, see the 8XC51/80C31 8-bit CMOS (low voltage, low power, and high speed) microcontroller families datasheet.
All the families are Single-Chip 8-Bit Microcontrollers manufactured in advanced CMOS process and are derivatives of the 80C51 microcontroller family. All the devices have the same instruction set as the 80C51.
These devices provide architectural enhancements that make them applicable in a variety of applications for general control systems.
The ROMless devices, 80C51FA, and 80C51RA+ can address up to 64K of external memory. All the devices have four 8-bit I/O ports, three 16-bit timer/event counters, a multi-source, four-priority-level, nested interrupt structure, an enhanced UART and on-chip oscillator and timing circuits. For systems that require extra memory capability up to 64k bytes, each can be expanded using standard TTL-compatible memories and logic.
Its added features make it an even more powerful microcontroller for applications that require pulse width modulation, high-speed I/O and up/down counting capabilities such as motor control. It also has a more versatile serial channel that facilitates multiprocessor communications.

特性 Features

80C51 Central Processing Unit
Speed up to 33 MHz
Full static operation
Operating voltage range: 2.7 V to 5.5 V @ 16 MHz
Security bits: ROM - 2 bits
OTP-EPROM - 3 bits

Encryption array - 64 bytes
RAM expandable to 64K bytes
4 level priority interrupt
6 or7 interrupt sources, depending on device
Four 8-bit I/O ports
Full-duplex enhanced UART Framing error detection
Automatic address recognition

Power control modes Clock can be stopped and resumed
Idle mode
Power down mode

Programmable clock out
Second DPTR register
Asynchronous port reset
Low EMI (inhibit ALE)