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CF745 Datasheet PDF : 217 Pages
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PIC16C5X
4.2.2 SPECIAL FUNCTION REGISTERS
The Special Function Registers are registers used by
the CPU and peripheral functions to control the
operation of the device (Table 4-1).
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 4-1: 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
Value on
MCLR and
WDT Reset
N/A
TRIS
I/O control registers (TRISA, TRISB, TRISC)
1111 1111 1111 1111
N/A
OPTION Contains control bits to configure Timer0 and Timer0/WDT prescaler
--11 1111 --11 1111
00h
INDF
Uses contents of FSR to address data memory (not a physical register) xxxx xxxx uuuu uuuu
01h
TMR0
8-bit real-time clock/counter
xxxx xxxx uuuu uuuu
02h(1)
PCL
Low order 8 bits of PC
1111 1111 1111 1111
03h
STATUS
PA2 PA1 PA0
TO
PD
Z
DC
C 0001 1xxx 000q quuu
04h
FSR
Indirect data memory address pointer
1xxx xxxx 1uuu uuuu
05h
PORTA
—
—
—
—
RA3 RA2 RA1 RA0 ---- xxxx ---- uuuu
06h
PORTB
RB7 RB6 RB5 RB4 RB3 RB2 RB1 RB0 xxxx xxxx uuuu uuuu
07h(2)
PORTC
RC7 RC6 RC5 RC4 RC3 RC2 RC1 RC0 xxxx xxxx uuuu uuuu
Legend:
Note 1:
2:
Shaded boxes = unimplemented or unused, – = unimplemented, read as '0' (if applicable)
x = unknown, u = unchanged, q = see the tables in Section 7.7 for possible values.
The upper byte of the Program Counter is not directly accessible. See Section 4.5
for an explanation of how to access these bits.
File address 07h is a general purpose register on the PIC16C52, PIC16C54s, PIC16CR54s, PIC16C56s, PIC16CR56s,
PIC16C58s and PIC16CR58s.
© 1998 Microchip Technology Inc.
Preliminary
DS30453B-page 19
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