Getac Technology Corporation V110GD Manuale Utente

PIC32MX1XX/2XX

DS61168C-page 100

Preliminary

REGISTER 8-2:

OSCTUN: FRC TUNING REGISTER

(1)

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

U-0

—

23:16

U-0

R-0

U-0

—

15:8

U-0

R-0

U-0

—

7:0

U-0

R/W-0

—

TUN<5:0>

(2)

Legend:

y = Value set from Configuration bits on POR

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 31-6

Unimplemented:

Read as ‘0’

bit 5-0

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.

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.