M16C28 Datasheet, PDF (398/423 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/28 Group (M16C/28, M16C/28B)
20. Precautions
20.15 Noise
Connect a bypass capacitor (approximately 0.1µF) across the VCC and VSS pins using the shortest and
thicker possible wiring. Figure 20.6 shows the bypass capacitor connection.
M16C/28 Group
VSS
VCC
Connecting Pattern Connecting Pattern
Bypass Capacitor
Figure 20.6 Bypass Capacitor Connection
20.15.1 Trace of Print Board (85-pin Package)
Creat a layout with thick lines as shown in Figure 20.7 for the trace around clock pins on the print board
to avoid the effect of noise input from other pins to the clock pins (XIN, XOUT, XCIN, XCOUT).
A
B
C
D
E
F
G
H
J
K
10
61
60
58
55
52
50
47
44
42
38
P06
P07
P11
P14
P17
P21
P24
P27
P61
P31
9
6
63
59
56
53
51
48
45
43
39
P05
P04
P10
P13
P16
P20
P23
P26
P60
P30
8
6
65
66
57
54
(11)
49
46
41
40
P03
P02
P01
P12
P15
(Vss)*
P22
P25
P62
P63
7
6
68
69
P00
P107
P106
37
36
35
P32
P33
P34
6
7
71
(11)
P105
P104
(Vss)*
34
33
32
P35
P36
P37
5
7
73
72
P101
P102
P103
4
7
76
75
(11)
Vref
P100
AVss (Vss)*
(11)
(Vss)*
31
30
P64
P65
29
28
27
P66
P67
P70
3
7
79
4
9
11
14
17
26
25
24
AVcc
P97
P91
RESET
Vss P85
P82
P71
P72
P73
2
8
2
5
7
12
13
16
19
23
22
P96
P93
P90
P87/XCIN
XIN
Vcc
P83
P80
P74
P75
1
1
3
6
8
10
13
15
18
21
20
P95
P92
CNVss P86/XCOUT XOUT Vcc
P84
P81
P76
P77
Figure 20.7 Recommended Print Board Trace around Clock Pins
Rev. 2.00 Jan. 31, 2007 ^{page 378} of 385
REJ09B0047-0200