PIC16F877A: Interfacing Seven Segment Display

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Questions and Answers

Which letters can be displayed using a 7 segment display?

M to R

G to L

A to F (correct)

S to Z

What is the purpose of the decimal point or dp in a 7 segment display?

To indicate an error in the displayed number

To indicate a negative number

To indicate the separation of integer and fractional parts (correct)

To indicate the start of a new number

How are the cathode terminals connected in a Common Cathode 7 segment display?

They are connected to each segment separately

They are made common and tied to VCC

They are made common and tied to GND (correct)

They are left unconnected

In a Common Cathode 7 segment display, what type of signal is required for a segment to glow?

Logic High signal (5v) Signup and view all the answers

What type of signal is required for a segment to glow in a Common Anode 7 segment display?

Logic Low signal (GND) Signup and view all the answers

How are the anode terminals connected in a Common Anode 7 segment display?

They are made common and tied to VCC(5v) Signup and view all the answers

Which section of the PIC 16F877 chip contains the programs written by the user?

Program memory Signup and view all the answers

What is the range of addresses for the special function register file (SFR) in a PIC 16F877 chip?

0 to 511 Signup and view all the answers

Which bank is the default bank for accessing the special function register (SFR) byte in a PIC 16F877 chip?

Bank0 Signup and view all the answers

In which addressing mode is the operand a number or constant, not an address?

Immediate addressing mode Signup and view all the answers

What type of memory is used to store non-volatile data in a PIC 16F877 chip?

Data EEPROM Signup and view all the answers

In a PIC 16F877 chip, what is the size of each bank for SFR registers in Bank1?

32 bytes Signup and view all the answers

In the immediate addressing mode of a pic microcontroller, where is the data located with respect to the opcode?

After the opcode Signup and view all the answers

Which addressing mode deals with registers like CLR W?

Register operand addressing mode Signup and view all the answers

Under memory operand addressing mode, what does 'CLRF 13h' represent?

Direct addressing of memory location 13h Signup and view all the answers

How is direct addressing done?

Through a 9-bit address obtained by connecting the 7th bit of direct address Signup and view all the answers

What does indirect addressing derive from?

The IRP bit of STATUS and FSR registers Signup and view all the answers

What is the purpose of the FSR register in indirect addressing?

To hold the address indicated by the INDF register Signup and view all the answers

What does the INDF register in fact hold in indirect addressing?

The address indicated by the FSR register (FSR is a pointer) Signup and view all the answers

What kind of information does the Status Register contain?

Arithmetic status of the ALU and bank select bits for the data memory Signup and view all the answers

What is the purpose of the W Register in PIC microcontrollers?

To serve as an operand source for many instructions Signup and view all the answers

'MOVLW' instruction in PIC microcontrollers is used for what purpose?

'Move Literal Value Into W' Signup and view all the answers

Study Notes

7-Segment Display

The letters that can be displayed using a 7-segment display are A, B, C, D, E, F, G, H, I, J, L, O, P, U, Y
The decimal point (dp) in a 7-segment display is used to display fractions or decimal numbers
In a Common Cathode 7-segment display, the cathode terminals are connected together and connected to ground or Vss
A logic LOW signal is required for a segment to glow in a Common Cathode 7-segment display
A logic HIGH signal is required for a segment to glow in a Common Anode 7-segment display
In a Common Anode 7-segment display, the anode terminals are connected together and connected to Vcc

PIC 16F877 Chip

The program counter (PC) section of the PIC 16F877 chip contains the programs written by the user
The range of addresses for the special function register file (SFR) in a PIC 16F877 chip is 00h to 1Fh
Bank 0 is the default bank for accessing the special function register (SFR) byte in a PIC 16F877 chip
Immediate addressing mode is an addressing mode in a PIC microcontroller where the operand is a number or constant, not an address
Flash memory is used to store non-volatile data in a PIC 16F877 chip
Each bank for SFR registers in Bank1 of a PIC 16F877 chip is 80h bytes in size

Addressing Modes

In immediate addressing mode, the data is located with the opcode
The addressing mode that deals with registers is the Register Mode (e.g. CLR W)
In memory operand addressing mode, 'CLRF 13h' represents clearing the file register at address 13h
Direct addressing is done by specifying the address directly
Indirect addressing is derived from the file select register (FSR)
The FSR register in indirect addressing holds the address of the file register
The INDF register in indirect addressing holds the value of the file register
The Status Register contains information about the result of the last instruction executed (e.g. Zero, Carry, etc.)
The W Register in PIC microcontrollers is used to hold temporary results
The 'MOVLW' instruction in PIC microcontrollers is used to move a literal value to the W Register

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Description

Learn about interfacing seven segment display with PIC16F877A microcontroller in this lecture. Understand how seven segment displays work, their applications, and the arrangement of LED segments. Explore the use of a decimal point for displaying decimal digits and letters A to F.