PIC12F609-I/PQTP MICROCHIP [Microchip Technology], PIC12F609-I/PQTP Datasheet - Page 31

• Manufacturer Part Number: PIC12F609-I/PQTP
• Description: 8-Pin Flash-Based, 8-Bit CMOS Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

3.4.1.1
The oscillator is factory calibrated but can be adjusted
in software by writing to the OSCTUNE register
(Register 3-1).
REGISTER 3-1:
TABLE 3-2:
© 2006 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-5
bit 4-0
CONFIG
OSCTUNE
Legend:
Note 1:
Name
U-0
—
2:
(2)
x = unknown, u = unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by oscillators.
Other (non Power-up) Resets include MCLR Reset and Watchdog Timer Reset during normal operation.
See Configuration Word register (Register 11-1) for operation of all register bits.
OSCTUNE Register
IOSCFS
Bit 7
Unimplemented: Read as ‘0’
TUN<4:0>: Frequency Tuning bits
01111 = Maximum frequency
01110 =
•
•
•
00001 =
00000 = Oscillator module is running at the calibrated frequency.
11111 =
•
•
•
10000 = Minimum frequency
—
SUMMARY OF REGISTERS ASSOCIATED WITH CLOCK SOURCES
U-0
—
OSCTUNE: OSCILLATOR TUNING REGISTER
Bit 6
CP
—
W = Writable bit
‘1’ = Bit is set
MCLRE
Bit 5
U-0
—
—
PWRTE
PIC12F609/615/12HV609/615
TUN4
Bit 4
R/W-0
TUN4
Preliminary
WDTE
TUN3
Bit 3
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
FOSC2
R/W-0
The default value of the OSCTUNE register is ‘0’. The
value is a 5-bit two’s complement number.
When the OSCTUNE register is modified, the frequency
will begin shifting to the new frequency. Code execution
continues during this shift. There is no indication that the
shift has occurred.
TUN3
TUN2
Bit 2
FOSC1
TUN1
Bit 1
R/W-0
TUN2
FOSC0
TUN0
Bit 0
x = Bit is unknown
---0 0000
POR, BOR
R/W-0
TUN1
Value on
—
DS41302A-page 29
---u uuuu
Resets
Value on
R/W-0
all other
TUN0
—
bit 0
(1)