Datasheet
75
AT32UC3A
13.6.6 PM 32 KHz Oscillator Control Register
Register name OSCCTRL32
Register access Read/Write
Note: This register is only reset by Power-On Reset
• OSC32EN: Enable the 32 KHz oscillator
0: 32 KHz Oscillator is disabled
1: 32 KHz Oscillator is enabled
• 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
2 to 7: reserved
• STARTUP: Oscillator Startup Time
Select startup time for 32 KHz oscillator
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
7 6 5 4 3 2 1 0
- - - - - - - OSC32EN
Table 13-8. Startup time for 32 KHz oscillator
STARTUP
Number of RC oscillator
clock cycle
Approximative Equivalent time
(RCOsc = 115 kHz)
0 0 0
1 128 1.1 ms
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
32058K
AVR32-01/12