MikroElektronika PIC Microcontrollers PIC16 Specifications Page 129
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Chapter 6 - Samples
Connecting a microcontroller to 7-segment displays in multiplex mode
File Led.inc contains two macros: LED_Init and LED_Disp2. The first macro is used for display
initialization. That is where display refreshment period is defined as well as microcontroller pins
used for connecting the displays. The second macro is used for displaying numbers from 0 to 99
on two displays.
Macro LED_Disp2 has one argument:
LED_Disp2 first macro
first is the number from 0 to 99 to be displayed on Msd and Lsd digit.
Example: LED_Disp12 0x34
Number 34 will be shown on the display
Realization of a macro is given in the following listing.
http://www.mikroelektronika.co.yu/english/product/books/PICbook/6_09Poglavlje.htm (2 of 5) [4/2/2003 16:19:03]
- C o n t e n t s 1
- PIC book 2
- Send us a comment about a 5
- CHAPTER 1 6
- 1.2 Central Processing Unit 8
- 1.1 Memory unit 8
- 1.3 Bus 9
- 1.4 Input-output unit 10
- 1.5 Serial communication 10
- 1.6 Timer unit 11
- 1.7 Watchdog 11
- 1.9 Program 13
- CHAPTER 2 15
- CISC, RISC 16
- Applications 17
- Clock / instruction cycle 17
- Pipelining 17
- Pin description 18
- Types of oscillators 20
- XT Oscillator 20
- RC Oscillator 20
- 2.2 Reset 23
- 2.3 Central Processing Unit 25
- Arithmetic Logic Unit (ALU) 25
- STATUS Register 27
- OPTION register 28
- 2.4 Ports 31
- 2.5 Memory organization 33
- Program memory 33
- Data memory 33
- SFR registers 33
- Memory Banks 34
- Program Counter 35
- In System Programming 35
- Addressing modes 35
- Direct Addressing 35
- Indirect Addressing 36
- 2.6 Interrupts 38
- INTCON Register 38
- Interrupt initialization 43
- 2.7 Free-run timer TMR0 45
- OPTION Control Register 48
- 2.8 EEPROM Data memory 50
- EECON1 Register 50
- Reading from EEPROM Memory 51
- Writing to EEPROM Memory 51
- CHAPTER 3 53
- Arithmetic and logic 54
- Bit operations 54
- Directing a program flow 54
- Instruction Execution Period 55
- Word list 55
- Chapter 3 - Instruction Set 56
- CHAPTER 4 57
- Introduction 58
- Assembly language 59
- Instructions 59
- Operands 60
- Comments 60
- Directives 60
- Data Directives 66
- CHAPTER 5 72
- Chapter 5 - MPLAB 73
- Screen prior to installment 79
- Installment flow 80
- 5.2 MPLAB 82
- 5.4 Designing a project 85
- Adjusting project elements 86
- Opening a new project 88
- Assembler file added 88
- 5.6 Writing a program 91
- 5.7 MPSIM Simulator 93
- 5.8 Toolbar 95
- Toolbar icon description 95
- CHAPTER 6 98
- Macros used in programs 100
- Macros WAIT, WAITX 100
- Macro PRINT 101
- Chapter 6 - Samples 102
- Samples 104
- Light-Emitting Diodes - LEDs 104
- Keyboard 107
- Optocoupler 110
- Optocoupler on an input line 110
- Optocoupler on an output line 112
- The Relay 113
- Generating a sound 117
- Shift registers 121
- Input shift register 74HC597 121
- Output shift register 124
- LCD Display 133
- Macro for LCD support 139
- Serial Communication 150
- Main program: 154
- Appendix A 156
- A.2 MOVWF Copy W to f 157
- A.3 MOVF Copy f to d 157
- A.4 CLRW Write 0 in W 158
- A.5 Write 0 in f 158
- Appendix A - Instruction Set 159
- A.8 ADDWF Add W to f 160
- A.17 INCF Increment f 164
- A.18 DECF Decrement f 165
- A.21 COMF Complement f 168
- A.23 BSF Set bit b in f 169
- A.33 NOP No operation 174
- Appendix B 177
- B.2 Binary numeric system 178
- Appendix B - Numeric Systems 179
- Conclusion 181
- Appendix C 183
- Appendix C - Glossary 184
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