PIC16F84A-04-P Datasheet, PDF (83/90 Pages) Microchip Technology – 18-pin Enhanced FLASH/EEPROM 8-Bit Microcontroller

Prescaler, Timer0
Assignment (PSA Bit) ................................................... 9
Rate Select (PS2:PS0 Bits) .......................................... 9
Program Counter ................................................................ 11
PCL , Register....................................................7 11, 25
PCLATH Register ............................................7, 11, 25
Reset Conditions......................................................... 24
Program Memory .................................................................. 5
General Purpose Registers........................................... 6
, Interrupt Vector ...................................................... 5 29
RESET Vector............................................................... 5
, Special Function Registers ...................................... 6 7
Programming, Device Instructions ...................................... 35
R
RAM. See Data Memory
Reader Response ............................................................... 86
Register File .......................................................................... 6
Register File Map .................................................................. 6
Registers
Configuration Word ..................................................... 21
EECON1 (EEPROM Control)...................................... 13
INTCON ...................................................................... 10
OPTION ........................................................................ 9
STATUS........................................................................ 8
, Reset............................................................................ 21 24
, Block Diagram...................................................... 24 26
MCLR Reset. See MCLR
Power-on Reset (POR). See Power-on Reset (POR)
Reset Conditions for All Registers .............................. 25
Reset Conditions for Program Counter....................... 24
Reset Conditions for STATUS Register...................... 24
WDT Reset. See Watchdog Timer (WDT)
Revision History .................................................................. 77
RP1:RP0 (Bank Select) bits .................................................. 8
S
Saving W Register and STATUS in RAM ........................... 30
SLEEP , ............................................................ 21 24, 29, 32
Software Simulator (MPLAB SIM)....................................... 45
Special Features of the CPU .............................................. 21
, Special Function Registers .............................................. 6 7
Speed, Operating .............................................. 1, 22, 23, 55
Stack ................................................................................... 11
STATUS Register ............................................... 7, 8, 25, 30
C Bit .............................................................................. 8
DC Bit............................................................................ 8
PD Bit................................................. 8, 24, 28, 32, 33
Reset Conditions......................................................... 24
RP0 Bit.......................................................................... 6
TO Bit...........................................8, 24, 28, 30, 32, 33
Z Bit............................................................................... 8
T
Time-out (TO) Bit. See Power-on Reset (POR)
Timer0 ................................................................................. 19
Associated Registers .................................................. 20
Block Diagram............................................................. 19
Clock Source Edge Select (T0SE Bit)........................... 9
Clock Source Select (T0CS Bit).................................... 9
, Overflow Enable (T0IE Bit) .................................. 10 29
Overflow Flag (T0IF Bit).................................10, 20, 29
, Overflow Interrupt ................................................ 20 29
Prescaler. See Prescaler
RA4/T0CKI Pin, External Clock .................................. 19
TMR0 , Register.................................................7 20, 25
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PIC16F84A
Timing Conditions ............................................................... 54
Timing Diagrams
CLKOUT and I/O ........................................................ 56
Diagrams and Specifications ...................................... 55
CLKOUT and I/O Requirements......................... 56
External Clock Requirements ............................. 55
RESET, Watchdog Timer, Oscillator
Start-up Timer and Power-up
Timer Requirements................................... 57
Timer0 Clock Requirements ............................... 58
External Clock ............................................................ 55
RESET, Watchdog Timer, Oscillator Start-up
Timer and Power-up Timer................................. 57
, Time-out Sequence on Power-up.........................27 28
Timer0 Clock .............................................................. 58
Wake-up From Sleep Through Interrupt ..................... 32
Timing Parameter Symbology ............................................ 53
TO bit .................................................................................... 8
W
, W Register ....................................................................25 30
Wake-up from SLEEP...............................21, 26, 28, 29, 32
, Interrupts ..............................................................32 33
MCLR Reset ............................................................... 32
WDT Reset ................................................................. 32
, Watchdog Timer (WDT)................................................21 30
Block Diagram ............................................................ 31
Postscaler. See Prescaler
Programming Considerations ..................................... 31
RC Oscillator .............................................................. 30
Time-out Period .......................................................... 30
WDT Reset, Normal Operation................................... 24
, WDT Reset, SLEEP .............................................24 32
WWW Address ................................................................... 85
WWW, On-Line Support ....................................................... 2
Z
Z (Zero) bit ............................................................................ 8
DS35007C-page 83