PIC18F2420/2520/4420/4520
External Signal ................................................. 235
Internal Signal................................................... 235
C
C Compilers
Response Time......................................................... 235
Comparator Specifications................................................ 338
Comparator Voltage Reference........................................ 239
Accuracy and Error................................................... 240
Associated Registers................................................ 241
Configuring ............................................................... 239
Connection Considerations....................................... 240
Effects of a Reset ..................................................... 240
Operation During Sleep............................................ 240
Compare (CCP Module) ................................................... 142
Associated Registers................................................ 143
CCPRx Register ....................................................... 142
Pin Configuration...................................................... 142
Software Interrupt ..................................................... 142
Special Event Trigger ............................... 137, 142, 232
Timer1/Timer3 Mode Selection................................. 142
Compare (ECCP Module)................................................. 148
Special Event Trigger ............................................... 148
Computed GOTO................................................................ 56
Configuration Bits ............................................................. 249
Configuration Register Protection..................................... 266
Context Saving During Interrupts...................................... 103
CPFSEQ........................................................................... 284
CPFSGT ........................................................................... 285
CPFSLT............................................................................ 285
Crystal Oscillator/Ceramic Resonator................................. 23
Customer Change Notification Service............................. 407
Customer Notification Service .......................................... 407
Customer Support............................................................. 407
MPLAB C18 ..............................................................318
MPLAB C30 ..............................................................318
CALL .................................................................................282
CALLW..............................................................................311
Capture (CCP Module)......................................................141
Associated Registers ................................................143
CCP Pin Configuration..............................................141
CCPRxH:CCPRxL Registers ....................................141
Prescaler...................................................................141
Software Interrupt .....................................................141
Timer1/Timer3 Mode Selection.................................141
Capture (ECCP Module) ...................................................148
Capture/Compare/PWM (CCP).........................................139
Capture Mode. See Capture.
CCP Mode and Timer Resources.............................140
CCPRxH Register.....................................................140
CCPRxL Register......................................................140
Compare Mode. See Compare.
Interaction of Two CCP Modules ..............................140
Module Configuration................................................140
Clock Sources.....................................................................28
Selecting the 31 kHz Source.......................................29
Selection Using OSCCON Register............................29
CLRF.................................................................................283
CLRWDT...........................................................................283
Code Examples
16 x 16 Signed Multiply Routine .................................90
16 x 16 Unsigned Multiply Routine .............................90
8 x 8 Signed Multiply Routine .....................................89
8 x 8 Unsigned Multiply Routine .................................89
Changing Between Capture Prescalers....................141
Computed GOTO Using an Offset Value....................56
Data EEPROM Read ..................................................85
Data EEPROM Refresh Routine.................................86
Data EEPROM Write ..................................................85
Erasing a Flash Program Memory Row ......................78
Fast Register Stack.....................................................56
How to Clear RAM (Bank 1) Using
D
Data Addressing Modes ..................................................... 68
Comparing Addressing Modes with the
Extended Instruction Set Enabled ...................... 71
Direct .......................................................................... 68
Indexed Literal Offset ................................................. 70
Instructions Affected........................................... 70
Indirect........................................................................ 68
Inherent and Literal..................................................... 68
Data EEPROM
Indirect Addressing .............................................68
Implementing a Real-Time Clock Using
Code Protection........................................................ 266
Data EEPROM Memory...................................................... 83
Associated Registers.................................................. 87
EEADR Register......................................................... 83
EECON1 and EECON2 Registers.............................. 83
Operation During Code-Protect .................................. 86
Protection Against Spurious Write.............................. 86
Reading ...................................................................... 85
Using .......................................................................... 86
Write Verify................................................................. 85
Writing ........................................................................ 85
Data Memory ...................................................................... 59
Access Bank............................................................... 62
and the Extended Instruction Set ............................... 70
Bank Select Register (BSR) ....................................... 59
General Purpose Registers ........................................ 62
Map for PIC18F2420/4420 ......................................... 60
Map for PIC18F2520/4520 ......................................... 61
Special Function Registers......................................... 63
DAW ................................................................................. 286
DC and AC Characteristics
a Timer1 Interrupt Service ................................131
Initializing PORTA.....................................................105
Initializing PORTB.....................................................108
Initializing PORTC.....................................................111
Initializing PORTD.....................................................114
Initializing PORTE.....................................................117
Loading the SSPBUF (SSPSR) Register..................164
Reading a Flash Program Memory Word ...................77
Saving STATUS, WREG and BSR
Registers in RAM..............................................103
Writing to Flash Program Memory ........................80–81
Code Protection ................................................................249
COMF................................................................................284
Comparator .......................................................................233
Analog Input Connection Considerations..................237
Associated Registers ................................................237
Configuration.............................................................234
Effects of a Reset......................................................236
Interrupts...................................................................236
Operation ..................................................................235
Operation During Sleep ............................................236
Outputs .....................................................................235
Reference .................................................................235
Graphs and Tables ................................................... 361
DS39631E-page 398
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