PIC16F610 Datasheet, PDF (31/180 Pages) Microchip Technology – 14-Pin, Flash-Based 8-Bit CMOS Microcontrollers

PIC16F610/616/16HV610/616
3.4.1.1 OSCTUNE Register
The oscillator is factory calibrated but can be adjusted
in software by writing to the OSCTUNE register
(Register 3-1).
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.
REGISTER 3-1: OSCTUNE: OSCILLATOR TUNING REGISTER
U-0
—
bit 7
U-0
U-0
R/W-0
R/W-0
R/W-0
—
—
TUN4
TUN3
TUN2
R/W-0
TUN1
R/W-0
TUN0
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-5
bit 4-0
Unimplemented: Read as ‘0’
TUN<4:0>: Frequency Tuning bits
01111 = Maximum frequency
01110 =
•
•
•
00001 =
00000 = Oscillator module is running at the manufacturer calibrated frequency.
11111 =
•
•
•
10000 = Minimum frequency
TABLE 3-2: SUMMARY OF REGISTERS ASSOCIATED WITH CLOCK SOURCES
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR, BOR
Value on
all other
Resets⁽¹⁾
CONFIG⁽²⁾ IOSCFS CP MCLRE PWRTE WDTE FOSC2 FOSC1 FOSC0
—
—
OSCTUNE
—
—
—
TUN4 TUN3 TUN2 TUN1 TUN0 ---0 0000 ---u uuuu
Legend:
Note 1:
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 12-1) for operation of all register bits.
© 2007 Microchip Technology Inc.
Preliminary
DS41288C-page 29