PIC18F2450/4450
2006 Microchip Technology Inc.
Advance Information
DS39760A-page 63
TABLE 5-2:
REGISTER FILE SUMMARY (PIC18F2450/4450)
File Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR, BOR
Details
on page
TOSU
Top-of-Stack Upper Byte (TOS<20:16>)
---0 0000
TOSH
Top-of-Stack High Byte (TOS<15:8>)
0000 0000
TOSL
Top-of-Stack Low Byte (TOS<7:0>)
0000 0000
STKPTR
STKFUL
STKUNF
SP4
SP3
SP2
SP1
SP0
00-0 0000
PCLATU
Holding Register for PC<20:16>
---0 0000
PCLATH
Holding Register for PC<15:8>
0000 0000
PCL
PC Low Byte (PC<7:0>)
0000 0000
TBLPTRU
—bit 21(1)
Program Memory Table Pointer Upper Byte (TBLPTR<20:16>)
--00 0000
TBLPTRH
Program Memory Table Pointer High Byte (TBLPTR<15:8>)
0000 0000
TBLPTRL
Program Memory Table Pointer Low Byte (TBLPTR<7:0>)
0000 0000
TABLAT
Program Memory Table Latch
0000 0000
PRODH
Product Register High Byte
xxxx xxxx
PRODL
Product Register Low Byte
xxxx xxxx
INTCON
GIE/GIEH
PEIE/GIEL
TMR0IE
INT0IE
RBIE
TMR0IF
INT0IF
RBIF
0000 000x
INTCON2
RBPU
INTEDG0
INTEDG1
INTEDG2
—TMR0IP
—RBIP
1111 -1-1
INTCON3
INT2IP
INT1IP
INT2IE
INT1IE
—INT2IF
INT1IF
11-0 0-00
INDF0
Uses contents of FSR0 to address data memory – value of FSR0 not changed (not a physical register)
N/A
POSTINC0
Uses contents of FSR0 to address data memory – value of FSR0 post-incremented (not a physical register)
N/A
POSTDEC0
Uses contents of FSR0 to address data memory – value of FSR0 post-decremented (not a physical register)
N/A
PREINC0
Uses contents of FSR0 to address data memory – value of FSR0 pre-incremented (not a physical register)
N/A
PLUSW0
Uses contents of FSR0 to address data memory – value of FSR0 pre-incremented (not a physical register) –
value of FSR0 offset by W
N/A
FSR0H
Indirect Data Memory Address Pointer 0 High Byte
---- 0000
FSR0L
Indirect Data Memory Address Pointer 0 Low Byte
xxxx xxxx
WREG
Working Register
xxxx xxxx
INDF1
Uses contents of FSR1 to address data memory – value of FSR1 not changed (not a physical register)
N/A
POSTINC1
Uses contents of FSR1 to address data memory – value of FSR1 post-incremented (not a physical register)
N/A
POSTDEC1
Uses contents of FSR1 to address data memory – value of FSR1 post-decremented (not a physical register)
N/A
PREINC1
Uses contents of FSR1 to address data memory – value of FSR1 pre-incremented (not a physical register)
N/A
PLUSW1
Uses contents of FSR1 to address data memory – value of FSR1 pre-incremented (not a physical register) –
value of FSR1 offset by W
N/A
FSR1H
Indirect Data Memory Address Pointer 1 High Byte
---- 0000
FSR1L
Indirect Data Memory Address Pointer 1 Low Byte
xxxx xxxx
BSR
Bank Select Register
---- 0000
INDF2
Uses contents of FSR2 to address data memory – value of FSR2 not changed (not a physical register)
N/A
POSTINC2
Uses contents of FSR2 to address data memory – value of FSR2 post-incremented (not a physical register)
N/A
POSTDEC2
Uses contents of FSR2 to address data memory – value of FSR2 post-decremented (not a physical register)
N/A
PREINC2
Uses contents of FSR2 to address data memory – value of FSR2 pre-incremented (not a physical register)
N/A
PLUSW2
Uses contents of FSR2 to address data memory – value of FSR2 pre-incremented (not a physical register) –
value of FSR2 offset by W
N/A
FSR2H
Indirect Data Memory Address Pointer 2 High Byte
---- 0000
FSR2L
Indirect Data Memory Address Pointer 2 Low Byte
xxxx xxxx
STATUS
—N
OV
Z
DC
C
---x xxxx
TMR0H
Timer0 Register High Byte
0000 0000
TMR0L
Timer0 Register Low Byte
xxxx xxxx
T0CON
TMR0ON
T08BIT
T0CS
T0SE
PSA
T0PS2
T0PS1
T0PS0
1111 1111
Legend:
x
= unknown, u = unchanged, - = unimplemented, q = value depends on condition. Shaded cells are unimplemented, read as ‘0’.
Note
1:
Bit 21 of the TBLPTRU allows access to the device Configuration bits.
2:
The SBOREN bit is only available when BOREN<1:0> = 01; otherwise, the bit reads as ‘0’.
3:
These registers and/or bits are not implemented on 28-pin devices and are read as ‘0’. Reset values are shown for 40/44-pin devices;
individual unimplemented bits should be interpreted as ‘-’.
4:
RA6 is configured as a port pin based on various primary oscillator modes. When the port pin is disabled, all of the associated bits read ‘0’.
5:
RE3 is only available as a port pin when the MCLRE Configuration bit is clear; otherwise, the bit reads as ‘0’.
6:
RC5 and RC4 are only available as port pins when the USB module is disabled (UCON<3> = 0).
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