PIC16F684
12.2 Calibration Bits
The Brown-out Detect (BOD), Power-on Reset (POR)
and 8 MHz internal oscillator (HFINTOSC) are factory
calibrated. These calibration values are stored in the
Calibration Word register, as shown in Register 12-2
and are mapped in program memory location 2008h.
Note:
Address 2008h is beyond the user program
memory space. It belongs to the special
configuration memory space (2000h-
3FFFh), which can be accessed only during
programming. See “PIC12F6XX/16F6XX
Memory Programming Specification”
(DS41204) for more information.
The Calibration Word register is not erased when the
device is erased when using the procedure described
in the “PIC12F6XX/16F6XX Memory Programming
Specification” (DS41204). Therefore, it is not
necessary to store and reprogram these values when
the device is erased.
REGISTER 12-2: CALIB – CALIBRATION WORD (ADDRESS: 2008h)
—
FCAL6 FCAL5 FCAL4 FCAL3 FCAL2 FCAL1 FCAL0
—
POR1 POR0 BOD2 BOD1 BOD0
bit 0
bit 13
bit 13
Unimplemented: Read as ‘0’
bit 12-6
FCAL<6:0>: Internal Oscillator Calibration bits
0111111= Maximum frequency
.
.
0000001
0000000= Center frequency
1111111
.
.
1000000= Minimum frequency
bit 5
Unimplemented: Read as ‘0’
bit 4-3
POR<1:0>: POR Calibration bits
00 = Lowest POR voltage
11 = Highest POR voltage
bit 2-0
BOD<2:0>: BOD Calibration bits
000 = Reserved
001 = Lowest BOD voltage
111 = Highest BOD voltage
Legend:
R = Readable
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
-n = Value at POR
2004 Microchip Technology Inc.
Preliminary
DS41202C-page 93
MICROCHIP [ MICROCHIP ]
