Datasheet
Page 22
Page 23
Board is equipped with 8MHz crystal oscillator
(X1) circuit that provides external clock waveform
to the microcontroller CLKO and CLKI 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:
External crystal
oscillator (X1)
30
29
28
27
34
33
46
36
35
42
43
44
45
37
50
48
49
32
38
39
40
41
47
31
26
9
11
12
4
3
24
23
18
17
16
15
14
13
5
6
7
8
10
1
2
22
21
20
19
25
78
77
79
80
76
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
58
57
56
55
54
53
52
72
69
68
67
66
65
64
63
62
61
60
59
71
51
70
75
74
73
VCC-3.3
VREF-1.8
C30
22pF
C31
22pF
X3 32.768KHz
C2
22pF
C1
22pF
X1 8MHz
E9
10uF
CLKO
CLKI
SOSCO
SOSCI
PIC24EP512GU810
R
B11
RB10
RB9
RB8
RB13
R
B12
RE7
RC1
RC2
RC3
ASDA1/RA15
D+/RG2
RB15
RB14
RF8
Vbus
Vusb
D-/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
RB3
RB4
RB5
RE9
RD9
RD8
RF2
USBID/RF3
GND
RG7/SDI2
RG6/SCK2
RA1
RE3
RE4
RG15
VDD
RB7/PGED 1
RB6/PGEC 1
RB0
RF4
RF5
ASCL1/RA14
RA5
RD14
RD15
ASCL2/RA2
RF13
VCC
ASDA2/RA3
VCC
ENVREG
RE8
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
C34
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 schematic