How To Load Program For At89c51 Controller

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In this project the speed of stepper motor is controlled by using the microcontroller by giving electric pulses to the motor. In this project AT8. C5. 1 microcontroller is used for controlling of permanent magnet type stepper motor. Extra Curricular Activities. Get the 2nd Prize in Essay competition. Get the 3rd prize in art competition at state level. Active member of Rotary Club in IIMT. Personal Details. Date of Birth 9th Jan 1. XXLanguages Known English, Tamil Hindi. Using ADC Module of PIC Microcontroller. Analog to Digital Converter ADC is a device that converts an analog quantity continuous voltage to discrete digital values. This is very useful when we want to do some processing on physical quantities, which are normally analog in nature. Most of the PIC Microcontrollers have built in ADC Module. Here we are using PIC 1. F8. 77. A for demonstrating the working. ADCSymbol. ADC of PIC Microcontrollers have 5 inputs for 2. It is a 1. 0 bit ADC, ie the conversion of analog signal results in corresponding 1. The positive and negative reference voltage Vref and Vref of PIC ADC is software selectable, which can be VDD, VSS, voltage at RA2 or RA3. This AD Converter module can also operate in sleep mode in which clock is derived from its internal RC oscillator. Following points may help you to understand the concept of reference voltages. When the ADC input is Vref, result will be 0. When the ADC input is Vref, result will be 1. Resolution of ADC Vref Vref2. ADC result by one bit. Here ADC Resolution 5 01. VSo, if the input is 5. V, ADC Value is 50. If the input is 0. V, ADC Value is 0. We require some hardware knowledge to program PIC ADC in Hi Tech C. If you dont need hardware knowledge please skip this part and go to Circuit Diagram. ADC Module in Detail. Registers. PIC ADC has 4 registers ADCON0 ADC Control Register 0. ADCON1 ADC Control Register 1. ADRESH ADC Result High Register. ADRESL ADC Result Low Register ADCON0 Register. ADCON0 Register PIC 1. F8. 77. AADCS1 and ADCS2 are used to select AD Conversion Clock. It should be selected in accordance with device clock. CH2, CH1 and CH0 are used to select one of the analog input channel out of eight channels. GODONE is the AD Conversion Status bit. Setting this bit initializes AD Conversion and will be automatically cleared when the conversion is complete. ADON is used to switch onoff the ADC Module. When it is 1, the ADC Module turns ON and when it is 0, the ADC Module will be OFF. ADCON1 Register. ADCON1 Register PIC 1. F8. 77. AADFM is the ADC Result Format select bit. Two 8 bit register ADRESH and ADRESL are provided to store the 1. AD Conversion, thus we needt use 6 bits. When ADFM is 1, the result will be right justified, ie Most Significant Bits of ADRESH will be read as 0. When ADFM is 0, the result will be left justified, ie Least Significant Bits of ADRESL will be read as zero. ADCS2 is used to select AD Conversion Clock in association with ADCS1 and ADC2 of ADCON0 register. PCFG3 PCFG0 are the AD Port Configuration Control bits. Each pin amoung AN0 AN7 is configured as analog, digital or reference voltage inputs according to the status of these configuration bits as given below. PIC ADC Port Configuration Bits. Note  TRIS Registers of Analog inputs must be configured as input for the proper operation. ADC Block Diagram. ADC Module Block Diagram PIC1. F8. 77. ASelection of AD Conversion Clock. The time for AD Conversion per bit is defined as TAD and it requires minimum 1. TAD to generate the 1. The time TAD is determined by the AD Conversion Clock which is software selectable to following options. TOSC4 TOSC8 TOSC1. TOSC3. 2 TOSC6. 4 TOSCInternal RC oscillator of ADC Module. TOSC is the time period of the device clock usually provided by the crystal oscillator. Wildlife Park Patch 1.19 here. Care should be taken while selecting the AD Conversion Clock, such that the clock should provide the minimum TAD 1. S required for the correct AD Conversion. So refer the following table before setting the ADC clock. ADC Clock Selection Table PIC 1. F8. 77. ACircuit Diagram. Using Internal ADC Module of PIC Microcontroller. I hope that you already go through our first tutorials, so I am not going to explain deeply about the circuit. The reference voltages of ADC is set to VDD 5. V and VSS GND though software code given below. Analog input is given to Channel 0 using a potentiometer, thus we can vary the ADC input voltage from VSS to VDD. The 1. 0 bit result of ADC is displayed using 1. LEDs, and 4. 70 resistors are used to limit current through them. Hi Tech C Codeincludelt htc. XTALFREQ 8. 00. 00. ADCInit. ADCON0 0x. ADC Module Turned ON and Clock is selected. ADCON1 0x. C0 All pins as Analog Input. With reference voltages VDD and VSS. ADCReadunsigned char channel. If Invalid channel selected. Return 0. ADCON0 0x. C5 Clearing the Channel Selection Bits. ADCON0 channellt lt 3 Setting the required Bits. Acquisition time to charge hold capacitor. GOn. DONE 1 Initializes AD Conversion. GOn. DONE Wait for AD Conversion to complete. ADRESHlt lt 8ADRESL Returns Result. TRISB 0x. 00 PORTB as output. TRISC 0x. 00 PORTC as output. TRISA 0x. FF PORTA as input. ADCInit Initializes ADC Module. ADCRead0 Reading Analog Channel 0. PORTB a Lower 8 bits to PORTB. PORTC a 8 Higher 2 bits to PORTC. Delay. while1 Infinite Loop. I think the program is completely explained through its comments. If you have any doubts please comment below. You can download Hi Tech C and Proteus files hereUsing Internal ADC PIC Hi Tech C.