Datasheet

62
32072H–AVR32–10/2012
AT32UC3A3
7.6.5 Oscillator 0/1 Control Registers
Name: OSCCTRL0,1
Access Type: Read/Write
Offset: 0x28-0x2C
Reset Value: 0x00000000
• STARTUP: Oscillator Startup Time
Select startup time for the oscillator.
• MODE: Oscillator Mode
Choose between crystal, or external clock
0: External clock connected on XIN, XOUT can be used as an I/O (no crystal)
1 to 3: reserved
4: Crystal is connected to XIN/XOUT - Oscillator is used with gain G0 ( XIN from
0.4 MHz to 0.9 MHz ).
5: Crystal is connected to XIN/XOUT - Oscillator is used with gain G1 ( XIN from 0.9 MHz to 3.0 MHz ).
6: Crystal is connected to XIN/XOUT - Oscillator is used with gain G2 ( XIN from 3.0 MHz to 8.0 MHz ).
7: Crystal is connected to XIN/XOUT - Oscillator is used with gain G3 ( XIN from 8.0 Mhz).
31 30 29 28 27 26 25 24
--------
23 22 21 20 19 18 17 16
--------
15 14 13 12 11 10 9 8
----- STARTUP
76543210
----- MODE
STARTUP
Number of RC oscillator
clock cycle
Approximative Equivalent time
(RCSYS = 115 kHz)
00 0
1 64 560 us
2128 1.1ms
32048 18ms
44096 36ms
58192 71ms
6 16384 142 ms
7 Reserved Reserved