Datasheet
PIC18F2331/2431/4331/4431
DS39616D-page 54 2010 Microchip Technology Inc.
TABLE 5-3: INITIALIZATION CONDITIONS FOR ALL REGISTERS
Register Applicable Devices
Power-on Reset,
Brown-out Reset
MCLR
Resets
WDT Reset
RESET Instruction
Stack Resets
Wake-up via WDT
or Interrupt
TOSU 2331 2431 4331 4431 ---0 0000 ---0 0000 ---0 uuuu
(3)
TOSH 2331 2431 4331 4431 0000 0000 0000 0000 uuuu uuuu
(3)
TOSL 2331 2431 4331 4431 0000 0000 0000 0000 uuuu uuuu
(3)
STKPTR 2331 2431 4331 4431 00-0 0000 uu-0 0000 uu-u uuuu
(3)
PCLATU 2331 2431 4331 4431 ---0 0000 ---0 0000 ---u uuuu
PCLATH 2331 2431 4331 4431 0000 0000 0000 0000 uuuu uuuu
PCL 2331 2431 4331 4431 0000 0000 0000 0000 PC + 2
(2)
TBLPTRU 2331 2431 4331 4431 --00 0000 --00 0000 --uu uuuu
TBLPTRH 2331 2431 4331 4431 0000 0000 0000 0000 uuuu uuuu
TBLPTRL 2331 2431 4331 4431 0000 0000 0000 0000 uuuu uuuu
TABLAT 2331 2431 4331 4431 0000 0000 0000 0000 uuuu uuuu
PRODH 2331 2431 4331 4431 xxxx xxxx uuuu uuuu uuuu uuuu
PRODL 2331 2431 4331 4431 xxxx xxxx uuuu uuuu uuuu uuuu
INTCON 2331 2431 4331 4431 0000 000x 0000 000u uuuu uuuu
(1)
INTCON2 2331 2431 4331 4431 1111 -1-1 1111 -1-1 uuuu -u-u
(1)
INTCON3 2331 2431 4331 4431 11-0 0-00 11-0 0-00 uu-u u-uu
(1)
INDF0 2331 2431 4331 4431 N/A N/A N/A
POSTINC0 2331 2431 4331 4431 N/A N/A N/A
POSTDEC0 2331 2431 4331 4431 N/A N/A N/A
PREINC0 2331 2431 4331 4431 N/A N/A N/A
PLUSW0 2331 2431 4331 4431 N/A N/A N/A
FSR0H 2331 2431 4331 4431 ---- xxxx ---- uuuu ---- uuuu
FSR0L 2331 2431 4331 4431 xxxx xxxx uuuu uuuu uuuu uuuu
WREG 2331 2431 4331 4431 xxxx xxxx uuuu uuuu uuuu uuuu
INDF1 2331 2431 4331 4431 N/A N/A N/A
POSTINC1 2331 2431 4331 4431 N/A N/A N/A
POSTDEC1 2331 2431 4331 4431 N/A N/A N/A
PREINC1 2331 2431 4331 4431 N/A N/A N/A
PLUSW1 2331 2431 4331 4431 N/A N/A N/A
Legend: u = unchanged, x = unknown, - = unimplemented bit, read as ‘0’, q = value depends on condition.
Shaded cells indicate conditions do not apply for the designated device.
Note 1: One or more bits in the INTCONx or PIRx registers will be affected (to cause wake-up).
2: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the PC is loaded with the
interrupt vector (0008h or 0018h).
3: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the TOSU, TOSH and TOSL are
updated with the current value of the PC. The STKPTR is modified to point to the next location in the
hardware stack.
4: See Table 5-2 for Reset value for specific condition.
5: Bits 6 and 7 of PORTA, LATA and TRISA are enabled depending on the oscillator mode selected. When
not enabled as PORTA pins, they are disabled and read ‘0’.
6: Bit 3 of PORTE and LATE are enabled if MCLR
functionality is disabled. When not enabled as the PORTE
pin, they are disabled and read as ‘0’. The 28-pin devices do not have only RE3 implemented.