Replicate ATmel IC AT89C4051 Eeprom Data

Replicate ATmel IC AT89C4051 Eeprom Data

the AT89C4051 is designed with static logic for operation down to zero frequency and supports two software-selectable power saving modes which is the critical features for Replicate ATmel IC AT89C4051 Eeprom Data.

The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt system to continue functioning. The power-down mode saves the RAM contents but freezes the oscillator disabling all other chip functions until the next hardware reset.
Port 1 is an 8-bit bi-directional I/O port. Port pins P1.2 to P1.7 provide internal pullups. P1.0 and P1.1 require external pullups. P1.0 and P1.1 also serve as the positive input (AIN0) and the negative input (AIN1), respectively, of the on-chip precision analog comparator.

The Port 1 output buffers can sink 20 mA and can drive LED displays directly. When 1s are written to Port 1 pins, they can be used as inputs. When pins P1.2 to P1.7 are used as inputs and are externally pulled low, they will source current (IIL) because of the internal pullups.

Port 1 also receives eeprom data data during Flash programming and verification. Port 3 pins P3.0 to P3.5, P3.7 are seven bi-directional I/O pins with internal pullups. P3.6 is hard-wired as an input to the output of the on-chip comparator and is not accessible as a general-purpose I/O pin.

The Port 3 output buffers can sink 20 mA. When 1s are written to Port 3 pins they are pulled high by the internal pullups and can be used as inputs. As inputs, Port 3 pins that are externally being pulled low will source current (IIL) because of the pullups when Replicate ATmel IC AT89C4051 Eeprom Data.

Port 3 also serves the functions of various special features of the AT89C4051 as listed below: Port 3 also receives some control signals for Flash programming and verification.

There are no requirements on the duty cycle of the external clock signal, since the input to the internal clocking circuitry is through a divide-by-two flip-flop, but minimum and maximum voltage high and low time specifications must be observed.

The AT89C4051 is an economical and cost-effective member of Atmel’s growing family of microcontrollers. It contains 4K bytes of Flash program memory. It is fully compatible with the MCS-51 architecture, and can be programmed using the MCS-51 instruction set.

However, there are a few considerations one must keep in mind when utilizing certain instructions to program this device.