Datasheet
Page 24
Page 25
Board is equipped with 8MHz crystal
oscillator (X1) circuit that provides external
clock to the microcontroller OSC pins. This base
frequency is suitable for further clock multipliers and
ideal for generation of necessary USB clock, which ensures
proper operation of bootloader and your custom USB-based
applications. Board also contains 32.768kHz Crystal oscillator
(X3) which provides external clock for internal RTCC module.
5. Crystal oscillator
Figure 5-1:
Crystal oscillator
module (X1)
VCC-3.3
VREF-1.8
C31
22pF
C30
22pF
X3
32.768KHz
C2
22pF
C1
22pF
X1
8MHz
SOSCO
SOSCI
CLKO
CLKI
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
dsPIC33FJ256GP710A
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
RB11
RB10/AN10
RB9/AN9
RB8/AN8
RB13
RB12
RE7
RC1
RC2
RC3
RA15
SCL1/RG2
RB15
RB14
SDO1/RF8
SDI1/RF7
SCK1/RF6
SDA1/RG3
GND
VCC
RA6
RG0
RG1
RE0
RF1
RF0
RD7
RD6
RE6
RE5
RE2
RG13
RG12
RG14
RE1
RA7
RG8/SDO2
RA9/Vref-
RB1
RB2/AN2
RB3
RB4
RB5
RA13
RD9
RD8
U1RX/RF2
U1TX/RF3
GND
RG7/SDI2
RG6/SCK2
RA1
RE3
RE4
RG15
VCC
RB7/PGED1
RB6/PGEC1
RB0
RF4
RF5
RA14
RA5
RD14
RD15
RA2
RF13
VCC
RA3
VCC
VCC
RA12
RA0
VCC
GND
RF12
RA4
GND
VCAP
AGND
AVCC
RA10/Vref+
MCLR
RC4
CLKI/RC12
CLKO/RC15
RD10
RD3
RD1
SOSCI/RC13
SOSCO/RC14
GND
RD2
RD12
RD13
RD4
RD5
RG9
RD11
RD0
U1
C5
100nF
C6
100nF
C7
100nF
E8
10uF
VCC-3.3
VCC-3.3
VCC-3.3VCC-3.3
C8
100nF
VCC-3.3
decoupling capacitors
The use of crystal in all other schematics is implied even if it is purposely
left out, because of the schematics clarity.
NOTE :
Figure 5-2:
Crystal oscillator schematics