
2010 Microchip Technology Inc.
DS70138G-page 149
dsPIC30F3014/4013
REGISTER 20-2:
OSCTUN: FRC OSCILLATOR TUNING REGISTER
U-0
—
bit 15
bit 8
U-0
R/W-0
—
TUN<3:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-4
Unimplemented: Read as ‘0’
bit 3-0
TUN<3:0>: TUN Field Lower Two bits
The four-bit field specified by TUN<3:0> specifies the user tuning capability for the internal fast RC
oscillator (nominal 7.37 MHz).
0111
= Maximum frequency
0110
=
0101
=
0100
=
0011
=
0010
=
0001
=
0000
= Center frequency, oscillator is running at calibrated frequency
1111
=
1110
=
1101
=
1100
=
1011
=
1010
=
1001
=
1000
= Minimum frequency