Datasheet
74
AT32UC3A
13.6.5 PM Oscillator 0/1 Control
Register name OSCCTRL0,1
Register access Read/Write
• 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).
• STARTUP: Oscillator Startup Time
Select startup time for the oscillator.
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
7 6 5 4 3 2 1 0
- - - - - MODE
Table 13-7. Startup time for oscillators 0 and 1
STARTUP
Number of RC oscillator
clock cycle
Approximative Equivalent time
(RCOsc = 115 kHz)
0 0 0
1 64 560 us
2 128 1.1 ms
3 2048 18 ms
4 4096 36 ms
5 8192 71 ms
6 16384 142 ms
7 Reserved Reserved
32058K
AVR32-01/12