Datasheet

PIC16C5X
DS30453E-page 28 Preliminary  1997-2013 Microchip Technology Inc.
6.2.2 SPECIAL FUNCTION REGISTERS
The Special Function Registers are registers used by
the CPU and peripheral functions to control the opera-
tion of the device (Table 6-1).
The Special Registers can be classified into two sets.
The Special Function Registers associated with the
“core” functions are described in this section. Those
related to the operation of the peripheral features are
described in the section for each peripheral feature.
TABLE 6-1: SPECIAL FUNCTION REGISTER SUMMARY
Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Value on
Power-on
Reset
Details
on Page
N/A TRIS I/O Control Registers (TRISA, TRISB, TRISC)
1111 1111
35
N/A OPTION Contains control bits to configure Timer0 and Timer0/WDT prescaler
--11 1111
30
00h INDF Uses contents of FSR to address data memory (not a physical register)
xxxx xxxx
32
01h TMR0 Timer0 Module Register
xxxx xxxx
38
02h
(1)
PCL Low order 8 bits of PC
1111 1111
31
03h STATUS
PA2 PA1 PA0 TO PD ZDCC
0001 1xxx
29
04h FSR Indirect data memory address pointer
1xxx xxxx
(3)
32
05h PORTA
— — — — RA3 RA2 RA1 RA0
---- xxxx
35
06h PORTB RB7 RB6 RB5 RB4 RB3 RB2 RB1 RB0
xxxx xxxx
35
07h
(2)
PORTC RC7 RC6 RC5 RC4 RC3 RC2 RC1 RC0
xxxx xxxx
35
Legend: x = unknown, u = unchanged, – = unimplemented, read as '0' (if applicable). Shaded cells = unimplemented or unused
Note 1: The upper byte of the Program Counter is not directly accessible. See Section 6.5 for an explanation of how to access
these bits.
2: File address 07h is a General Purpose Register on the PIC16C54, PIC16CR54, PIC16C56, PIC16CR56, PIC16C58 and
PIC16CR58.
3: These values are valid for PIC16C57/CR57/C58/CR58. For the PIC16C54/CR54/C55/C56/CR56, the value on RESET is
111x xxxx and for MCLR
and WDT Reset, the value is 111u uuuu.