preview

Gun Control Research Paper

Better Essays

TIME OPERATED ELECTRICAL APPLIANCES CONTROL CONTENTS 1. Abbreviations 2. Introduction 3. Block Diagram 4. Block Diagram Description 5. Schematic 6. Schematic Description 7. Hardware Components ? Microcontroller ? Power supply ? Relays ? Lcd ? RTC ? devices 8. Circuit Description 9. Software 10. Conclusion (or) Synopsis 11. Future Aspects. 12. Bibliography ABBREVIATIONS SYMBOL NAME ACC Accumulator B B register PSW Program status word SP Stack pointer DPTR Data pointer 2 bytes DPL Low byte DPH High byte P0 Port0 P1 Port1 P2 Port2 P3 Port3 IP Interrupt priority control IE Interrupt enable control TMOD Timer/counter mode control TCON Timer/counter control T2CON Timer/counter 2 control T2MOD …show more content…

The Port 1 output buffers can sink/source four TTL inputs. When 1s are written to Port 1 pins, they are pulled high by the internal pull-ups and can be used as inputs. As inputs, Port 1 pins that are externally being pulled low will source current (IIL) because of the internal pull-ups. Port 1 also receives the low-order address bytes during Flash programming and verification. Port 2: Port 2 is an 8-bit bidirectional I/O port with internal pull-ups. The Port 2 output buffers can sink/source four TTL inputs. When 1s are written to Port 2 pins, they are pulled high by the internal pull-ups and can be used as inputs. As inputs, Port 2 pins that are externally being pulled low will source current (IIL) because of the internal pull-ups. Port 2 also receives the high-order address bits and some control signals during Flash programming and verification. Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. The Port 3 output buffers can sink/source four TTL inputs. When 1s are written to Port 3 pins, they are pulled high by the internal pull-ups and can be used as inputs. As inputs, Port 3 pins that are externally being pulled low will source current (IIL) because of the pull-ups. Port 3 receives some control signals for Flash programming and verification. Port 3 also serves the functions of various special features of the AT89S51, as shown in the following …show more content…

Ripples can be removed by one of the following methods of filtering. (a) A capacitor, in parallel to the load, provides an easier by ?pass for the ripples voltage though it due to low impedance. At ripple frequency and leave the d.c.to appears the load. (b) An inductor, in series with the load, prevents the passage of the ripple current (due to high impedance at ripple frequency) while allowing the d.c (due to low resistance to d.c) (c) Various combinations of capacitor and inductor, such as L-section filter section filter, multiple section filter etc. which make use of both the properties mentioned in (a) and (b) above. Two cases of capacitor filter, one applied on half wave rectifier and another with full wave

Get Access