PIC32MX1XX Datasheet, PDF (100/320 Pages) Microchip Technology – 32-bit Microcontrollers (up to 128 KB Flash and 32 KB SRAM) with Audio and Graphics Interfaces, USB, and Advanced Analog

PIC32MX1XX/2XX
REGISTER 8-2: OSCTUN: FRC TUNING REGISTER⁽¹⁾
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Range 31/23/15/7 30/22/14/6 29/21/13/5 28/20/12/4 27/19/11/3 26/18/10/2
U-0
31:24
—
U-0
23:16
—
U-0
15:8
—
U-0
7:0
—
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
R-0
U-0
U-0
U-0
U-0
—
—
—
—
—
R-0
U-0
U-0
U-0
U-0
—
—
—
—
—
U-0
R/W-0
R/W-0
R/W-0
R/W-0
—
TUN<5:0>⁽²⁾
Bit
25/17/9/1
U-0
—
U-0
—
U-0
—
R/W-0
Bit
24/16/8/0
U-0
—
U-0
—
U-0
—
R/W-0
Legend:
R = Readable bit
-n = Value at POR
y = Value set from Configuration bits on POR
W = Writable bit
U = Unimplemented bit, read as ‘0’
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 31-6
bit 5-0
Unimplemented: Read as ‘0’
TUN<5:0>: FRC Oscillator Tuning bits⁽²⁾
100000 = Center frequency -12.5%
100001 =
•
•
•
111111 =
000000 = Center frequency. Oscillator runs at minimal frequency (8 MHz)
000001 =
•
•
•
011110 =
011111 = Center frequency +12.5%
Note 1: Writes to this register require an unlock sequence. Refer to Section 6. “Oscillator” (DS61112) in the
“PIC32 Family Reference Manual” for details.
2: OSCTUN functionality has been provided to help customers compensate for temperature effects on the
FRC frequency over a wide range of temperatures. The tuning step size is an approximation, and is neither
characterized, nor tested.
DS61168D-page 100
Preliminary
© 2011-2012 Microchip Technology Inc.