👉40 pin chips available in different packages.
👉It has four eight bit I/O ports.
👉Each port except P1 can be used for two different function.
👉All functions may not be used together.
👉To access the pin either we have to give the instruction or physically connect it.
👉It has effectively 66 pins (40 normal pins +24 alternate function of the port + 2 for programing).
✏️Vcc POWER SUPPLY INPUT PIN
👉The 8051 operates at DC power supply of +5V with respect to ground.
👉The +5V is to be connected to pin 40 (Vcc).
👉Variation of 10% to 20% in Vcc value is allowed depending on 8051 variant.
GND:GROUND
👉Pin 20 is ground.
👉The supply is connected with respect to the ground.
XTAL1 and XTAL2: Oscillator pins
👉The 8051 has an internal oscillator circuit.
👉It generates the clock pulse which synchronizes all internal operations.
👉To make complete oscillator external resonant circuit is connected.
👉Normally quartz and capacitors are connected.
👉Microcontroller works at crystal frequency.
👉The maximum speed refers to maximum crystal frequency that can be connected to XTAL.
👉The minimum speed indicates that the minimum speed required in the operation otherwise data will be lost.
👉We can use external oscillator for this signal is connected to XTAL1 and XTAL2 left free.
No comments:
Post a Comment
If you have any doubts or clarification you need in my blog topics, I would 💯 try to clear it in an efficient manner as possible. I will also accept your suggestions.