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PIC12F508/509/16F505
DS41236E-page 20
2009 Microchip Technology Inc.
4.3.2
SPECIAL FUNCTION REGISTERS
The Special Function Registers (SFRs) are registers
used by the CPU and peripheral functions to control the
operation of the device (Table 4-1).
The Special Function 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 (SFR) SUMMARY (PIC12F508/509)
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
Power-On
Reset(2)
Page #
00h
INDF
Uses Contents of FSR to Address Data Memory (not a physical
register)
xxxx xxxx
01h
TMR0
8-bit Real-Time Clock/Counter
xxxx xxxx
02h(1)
PCL
Low-order 8 bits of PC
1111 1111
03h
STATUS
GPWUF
—PA0(5)
TO
PD
ZDC
C
0-01 1xxx(3)
04h
FSR
Indirect Data Memory Address Pointer
111x xxxx
04h(4)
FSR
Indirect Data Memory Address Pointer
110x xxxx
05h
OSCCAL
CAL6
CAL5
CAL4
CAL3
CAL2
CAL1
CAL0
—
1111 111-
06h
GPIO
—
GP5
GP4
GP3
GP2
GP1
GP0
--xx xxxx
N/A
TRISGPIO
—
I/O Control Register
--11 1111
N/A
OPTION
GPWU
GPPU TOCS TOSE
PSA
PS2
PS1
PS0
1111 1111
Legend: – = unimplemented, read as ‘0’, x = unknown, u = unchanged, q = value depends on condition.
Note 1:
The upper byte of the Program Counter is not directly accessible. See Section 4.7 “Program Counter”
for an explanation of how to access these bits.
2:
Other (non Power-up) Resets include external Reset through MCLR, Watchdog Timer and wake-up on pin
change Reset.
3:
If Reset was due to wake-up on pin change, then bit 7 = 1. All other Resets will cause bit 7 = 0.
4:
PIC12F509 only.
5:
This bit is used on the PIC12F509. For code compatibility do not use this bit on the PIC12F508.
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相关PDF资料
PIC12F509T-I/SN
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