All these three types of microcontrollers are 8-bit manufactured by NXP semiconductors with embedded Intel processors.
Some of the key features of these microcontrollers are listed in the following sections but it is important to note that, you can get the full and latest details on each of the specific device from the official documentation.
Contents
The key features of these microcontrollers include:
The following figures below shows the architecture and pin connection in the 40-pin dual in-line package.
Architecture:
Pin Connection
Registers are classified as general purpose registers and special function registers. The 80C51 family of microcontrollers has an accumulator, B-register and four register banks, each having eight-bit wide registers R0 to R7. The registers R0 to R7 are used as scratch-pad registers. Additionally, there is an eight-bit wide stack pointer and a 16-bit wide program counter. Special function registers include program status word (PSW), data pointer (DPTR), timer registers, control registers and capture registers.
Related article: CPU Registers
The 80C51 family of microcontrollers, supports five addressing modes including register addressing, register direct addressing, register indirect addressing, immediate addressing and base register plus index register addressing.
Related: 6 Types of Microprocessor Addressing Modes
The 80C51 family of microcontrollers provides a variety of operational modes that can be used to reduce power consumption. These include STOP CLOCK MODE which enables the clock speed to be reduced down to 0 MHz, IDLE MODE when the CPU puts itself to sleep while all of the on-chip peripherals stay active and POWER DOWN MODE in which the oscillator is stopped. Additionally to the power saving operational modes, it also provides ONCETM (On-Circuit Emulation) MODE which facilitates in-circuit testing and debugging.
The 80C51 family of microcontrollers supports five factored interrupts. These include external interrupt 0, external interrupt 1, timer/counter 0 interrupt, timer/counter 1 interrupt and serial port interrupts.
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