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mikroElektronika | Free Online Book | PIC Microcontrollers | Chapter 7: Analog Modules
Fig. 7-13 VRCON Register
VREN Comparator C1 Voltage Reference Enable bit
● 1 - Voltage reference CVref source is powered on; and
● 0 - Voltage reference CVref source is powered off.
VROE Comparator C2 Voltage Reference Enable bit
● 1 - Voltage reference CVref is connected to the pin; and
● 0 - Voltage reference CVref is disconnected from the pin.
VRR - CVref Range Selection bit
● 1 - Voltage reference source is set to low range; and
● 0 - Voltage reference source is set to high range.
VRSS - Comparator Vref Range selection bit
● 1 - Voltage reference source is in the range of Vref+ to Vref-; and
● 0 - Voltage reference source is in the range of Vdd - Vss (power supply voltage).
VR3 - VR0 CVref Value Selection
If VRR = 1 (low range)
Voltage reference is calculated using the formula: CVref = ([VR3:VR0]/24)Vdd
If VRR = 0 (high range)
Voltage reference is calculated using the formula: CVref = Vdd/4 + ([VR3:VR0]/32)Vdd
In Short:
In order to properly use built in Comparators, it is necessary to do the following:
Step 1 - Configuring module:
● In order to select the appropriate mode, bits of the registers CM1CON0 and CM2CON0 should be configured.
Interrupt should be disabled on any change of mode.
Step 2 - Configuring internal voltage reference Vref source (only when used). In the VRCON register it is necessary to :
● Select one of two voltage ranges using the VRR bit;
● Configure necessary Vref using bits VR3 - VR0;
● Set the VROE bit if needed; and
● Enable voltage Vref source by setting the VREN bit.
http://www.mikroe.com/en/books/picmcubook/ch7/ (13 of 14)5/3/2009 11:34:24 AM
- BASIC CONCEPT 3
- Fig. 0-8 High and Low nibbles 9
- Fig. 0-17 Register 12
- Fig. 0-27 Timers/Counters 21
- Fig. 0-28 Timer Operation 22
- Fig. 0-31 Watchdog Timer 25
- Internal Architecture 26
- How to make the right choice 28
- ● AN3 Third analog input 34
- Table 1-1 Pin Assignment 35
- Fig. 1-4 CPU Memory 37
- Fig. 1-5 ROM Memory Consept 38
- Table 1-2 Address Banks 40
- Table 1-3 SFR Bank 0 41
- Table 1-4 SFR Bank 1 42
- Table 1-5 SFR Bank 2 43
- Table 1-6 SFR Bank 3 43
- Fig.1-7 Interrupt System 44
- Chapter 2: Core SFRs 45
- Table 2-1 46
- Table 2-2 48
- Fig. 2-9 Interrupt SFRs 49
- Fig. 2-10 INTCON Register 49
- Fig. 2-11 PIE1 register 50
- Fig. 2-12 PIE2 Register 51
- Fig. 2-13 PIR1 Register 52
- Fig. 2-14 PIR2 register 53
- Fig. 2-15 PCON register 54
- Fig. 2-17 PCLATH Registers 55
- Chapter 3: I/O Ports 57
- Port A and TRISA Register 58
- Fig. 3-3 ULPWU Unit 59
- Fig. 3-4 Sleep Mode 60
- Fig. 3-6 WPUB register 61
- Fig. 3-7 Pull-up resistors 61
- Fig. 3-8 IOCB register 62
- Fig. 3-9 Keyboard Example 62
- Fig. 3-10 ICSP Connection 63
- Chapter 4: Timers 67
- Fig. 4-1 Timer TMR0 68
- Fig. 4-2 OPTION_REG Register 68
- Fig. 4-5 Timer TMR1 71
- Fig. 4-8 TMR1 in timer mode 73
- Fig. 4-11 Counter Mode 75
- Fig. 4-12 T1CON Register 75
- Fig. 4-13 Timer TMR2 77
- Fig. 4-14 T2CON Register 77
- Chapter 5: CCP Modules 79
- Fig. 5-1 CCP1 Module 80
- Fig. 5-2 CCP1 in Capture mode 80
- Fig. 5-3 CCP1 in Compare mode 81
- Fig. 5-4 CCP1 in PWM mode 82
- Fig. 5-6 PWM module 83
- Fig.5-7 PWM Mode 83
- Fig. 5-8 CCP1CON Register 85
- Table 5-4 CCP1CON Register 85
- Table 5-5 Modes of Operations 86
- Fig. 5-9 CCP2 Module 86
- Fig. 5-10 CCP2CON Register 87
- Table 5-6 CCP2CON Register 87
- Fig. 5-12 Half-Bridge Mode 89
- Fig. 5-13 Half Bridge Mode 89
- Fig. 5-15 Full-Bridge Mode 90
- Fig. 5-16 Forward Mode 91
- Fig. 5-17 Reverse Mode 91
- Fig. 5-18 PWM1CON Register 92
- Fig. 5-19 ECCPAS Register 92
- EUSART Asynchronous Mode 95
- Fig. 6-5 Receiving 9-bit Data 98
- Fig. 6-7 Sending Data 99
- Fig.6-8 TXSTA Register 99
- Fig.6-9 RCSTA Register 100
- BAUDCTL Register 104
- Fig. 6-11 BAUDCTL Register 105
- SPI Mode 107
- Fig. 6-13 SPI Mode 108
- Fig. 6-14 SPI Mode 108
- I²C mode 109
- Fig. 6-21 Data Transfer 111
- Fig. 6-23 SSPSTAT Register 112
- Fig. 6-24 SSPCON Register 114
- Fig. 6-25 SSPCON2 Register 115
- Fig. 6-27 I²C in Master Mode 116
- I²C Master Mode 117
- Useful notes 119
- Chapter 7: Analog Modules 121
- A/D Acquisition Requirements 123
- How to Use A/D Converter? 123
- Fig. 7-6 Analog Comparator 127
- Fig. 7-7 VREF 128
- Fig. 7-8 CM1CON0 Regsiter 129
- Fig. 7-13 VRCON Register 133
- External Clock Modes 137
- Fig.8-3 PICflash Program 138
- Fig. 8-4 External Oscillator 138
- Internal Clock Modes 140
- Internal Oscillator Settings 141
- Two-Speed Clock Start-up Mode 142
- Fail-Safe Clock Monitor 143
- Fig.8-18 EECON1 Register 146
- Fig. 8-22 Noises 149
- Fig. 8-23 Master Clear Pin 149
- Chapter 9: Instruction Set 150
- Data Transfer Instructions 152
- Arithmetic-logic Instructions 152
- Bit-oriented Instructions 152
- ADDLW - Add literal and W 154
- ADDWF - Add W and f 154
- ANDLW - AND literal with W 155
- ANDWF - AND W with f 156
- BCF - Bit Clear f 157
- BSF - Bit set f 158
- CALL - Calls Subroutine 161
- CLRF - Clear f 161
- CLRW - Clear W 162
- CLRWDT - Clear Watchdog Timer 163
- COMF - Complement f 163
- DECF - Decrement f 164
- GOTO - Unconditional Branch 166
- INCF - Increment f 167
- IORWF - Inclusive OR W with f 169
- MOVF - Move f 170
- MOVLW - Move literal to W 171
- MOVWF - Move W to f 172
- NOP - No Operation 173
- Fig. 9-1 f Register 176
- Fig. 9-2 f Register 177
- SLEEP - Enter Sleep mode 178
- SUBWF - Subtract W from f 179
- SWAPF - Swap Nibbles in f 180
- XORWF - Exclusive OR W with f 181
- ELEMENTS OF ASSEMBLY LANGUAGE 185
- MACROS AND SUBROUTINES 191
- WRITING A NEW PROGRAM 200
- Appendix B: Examples 206
- ADDITIONAL COMPONENTS 209
- EXAMPLE 1 224
- EXAMPLE 2 227
- EXAMPLE 3 228
- Example 4 229
- Example 5 231
- EXAMPLE 6 233
- EXAMPLE 7 235
- EXAMPLE 8 237
- EXAMPLE 9 239
- EXAMPLE 10 240
- EXAMPLE 11 242
- EXAMPLE 12 244
- EXAMPLE 13 246
- goto Lsdon 247
- EXAMPLE 14 249
- EXAMPLE 15 252
- EXAMPLE 16 256
- COMPILING PROGRAM 261
- PROGRAMMING A MICROCONTROLLER 262
- Development systems 265
- Development system EasyPIC5 266
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