PIC16F84A_07 Datasheet, PDF (83/88 Pages) Microchip Technology – 18-pin Enhanced FLASH/EEPROM 8-bit Microcontroller

Power-on Reset (POR) ..........................................21, 24, 26
, Oscillator Start-up Timer (OST) ........................... 21 26
PD Bit................................................. 8, 24, 28, 32, 33
, Power-up Timer (PWRT) ..................................... 21 26
Time-out Sequence..................................................... 28
, Time-out Sequence on Power-up ........................ 27 28
TO Bit...........................................8, 24, 28, 30, 32, 33
Prescaler ............................................................................. 19
Assignment (PSA Bit) ................................................. 19
Block Diagram............................................................. 20
Rate Select (PS2:PS0 Bits) ........................................ 19
Switching Prescaler Assignment................................. 20
Prescaler, Timer0
Assignment (PSA Bit) ................................................... 9
Rate Select (PS2:PS0 Bits) .......................................... 9
PRO MATE II Universal Device Programmer ..................... 45
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
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 .................................................................. 75
RP1:RP0 (Bank Select) bits .................................................. 8
S
Saving W Register and STATUS in RAM ........................... 30
SLEEP , ............................................................ 21 24, 29, 32
Software Simulator (MPLAB SIM)....................................... 44
Special Features of the CPU .............................................. 21
, Special Function Registers .............................................. 6 7
Speed, , Operating .............................................. 1 22, 23, 57
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
PIC16F84A
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
Timing Conditions ............................................................... 56
Timing Diagrams
CLKOUT and I/O ........................................................ 58
Diagrams and Specifications ...................................... 57
CLKOUT and I/O Requirements......................... 58
External Clock Requirements ............................. 57
RESET, Watchdog Timer, Oscillator Start-up
Timer and Power-up
Timer Requirements................................... 59
Timer0 Clock Requirements ............................... 60
External Clock ............................................................ 57
RESET, Watchdog Timer, Oscillator Start-up
Timer and Power-up Timer................................. 59
, Time-out Sequence on Power-up.........................27 28
Timer0 Clock .............................................................. 60
Wake-up From SLEEP Through Interrupt .................. 32
Timing Parameter Symbology ............................................ 55
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, On-Line Support ....................................................... 2
Z
Z (Zero) bit ............................................................................ 8
© 2001 Microchip Technology Inc.
DS35007B-page 81