The 8051 is a 40-pin IC. Twenty-two pins are needed for the four I/O ports.

More Questions from The 8051 Microcontroller

• Different instruction sets must make up for the various members of the 8051 family.
• The RST pin requires a HIGH to reset the 8051 microcontroller.
• Up to 65K of code memory and 65K of data memory can be added to any of the 8051 family members.
• In an 8051 program DA A adjusts the value in the accumulator resulting from an addition into two BCDs.
• Writing counter/loop programs is much more difficult with the introduction of the DJNA and the CJNE instructions.
• Analog output current must be converted into a usable voltage. To perform this current-to-voltage conversion a 700 op amp may be used.
• A Celsius thermometer is an application for the 8051 microcontroller.
• The ADC 0804 is an analog-to-digital converter that provides 8-bit output resolution that can be directly interfaced to a microcontroller.
• A microcontroller is called a computer on a chip.

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