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Figure 5-1:
32.768kHz crystal oscillator
connected to RTCC module (X1)
VCC-3.3
C2
22pF
C1
22pF
X1
32.768kHz
30 29 28 27 34 33
58
57
56
55
54
53
52
46 36 35 42 43 44 45 37 50
9
48 49
11
12
32
72
69
68
67
66
65
64
63
4
3
78 77
24
23
18
17
16
15
14
13
5
6
7
8
10
79 80
1
2
22
21
20
19
62
61
60
59
38 39 40 41 47
71
31
51
70
26
25
76
75
74
73
ATxmega128A1
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
PE0 VCC GND PD7 PE7 PE6
PB0
PB1
PB2
PB3
PJ4
PJ3
PJ2
PH2
VCC GND
GND
VCC
PH0
PH1
PF0 PF1
XTAL
2/PR0
RESET/PDI
PDI
GN
D
PQ
3
PQ
2
GN
D
VCC
AVCC
GND
PA3 PA2 PA1 PA0
AVCC
XTAL
1/PR1
PB7
PD3
GND
PC7
PC6
PC5
PC4
PC3
PJ6
PJ5
PF7
PF6
VCC
PB6
PB5
PE3
PA4 PA5
PA6
PA7
PD2 PD1
PD0
VCC
PF4 PF5
PJ1
PH6
PF2 PF3
PH3
PE4 PE2
PH4
PH7
TOSC2/PQ
1
PC2
PC1
PC0
PE1 PE5
PH5
PJ0
TOSC1/PQ
0
PD6 PD5 PD4
GND
PB4
GND
VCC
PJ7
PK3 PK1
GND
VCC
PK0
PK2 PK4 PK5 PK6 PK7
U1
AVCC
PQ
1/TOSC
2
PQ
0/TOSC
1
C5
100nF
C6
100nF
C7
100nF
C8
100nF
E8
10uF
VCC-3.3 VCC-3.3 VCC-3.3
VCC-3.3
VCC-3.3
C31
100nF
VCC-3.3
C35
100nF
VCC-3.3
Figure 5-2:
Crystal oscillator
schematic
The use of crystal in all other schematics is implied even if it is purposely
left out because of the schematics clarity.
NOTE :
5. Crystal oscillators
ATxmega128A1 uses internal 2MHz and
32MHz oscillators that provide the necessary
clock frequency. In combination with prescalers
and multipliers it gives you a wide range of output
frequencies, which ensures proper operation of bootloader
and your custom applications. Board contains
32.768kHz
Crystal oscillator (X1) which provides external clock for internal
RTCC module.