Datasheet

32072H–AVR32–10/2012

AT32UC3A3

7.6.6 32 KHz Oscillator Control Register

Name: OSCCTRL32

Access Type: Read/Write

Offset: 0x30

Reset Value: 0x00000000

• STARTUP: Oscillator Startup Time

Select startup time for 32 KHz oscillator

Note: This register is only reset by Power-On Reset

• MODE: Oscillator Mode

Choose between crystal, or external clock

0: External clock connected on XIN32, XOUT32 can be used as a I/O (no crystal)

1: Crystal is connected to XIN32/XOUT32 - Oscillator is used with automatic gain control

2 to 7: Reserved

• OSC32EN: Enable the 32 KHz oscillator

0: 32 KHz Oscillator is disabled

1: 32 KHz Oscillator is enabled

31 30 29 28 27 26 25 24

--------

23 22 21 20 19 18 17 16

----- STARTUP

15 14 13 12 11 10 9 8

----- MODE

76543210

-------OSC32EN

STARTUP

Number of RC oscillator

clock cycle

Approximative Equivalent time

(RCSYS = 115 kHz)

00 0

1128 1.1ms

2 8192 72.3 ms

3 16384 143 ms

4 65536 570 ms

5 131072 1.1 s

6 262144 2.3 s

7 524288 4.6 s