Noise; Trace Of Print Board (85-Pin Package) - Renesas M16C FAMILY series Hardware Manual

M 1 6 C 2 / 8 G o r u p ( M 1 6 C

20.15 Noise

Connect a bypass capacitor (approximately 0.1µF) across the V
thicker possible wiring. Figure 20.6 shows the bypass capacitor connection.
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 (X
Figure 20.7 Recommended Print Board Trace around Clock Pins
R e . v 2 0 . 0 J a . n 3 , 1 2 0 0 7
R E J 0 9 B 0 0 4 7 0 - 2 0 0
2 / , 8 M 1 6 C 2 / 8 ) B
Connecting Pattern
A B C
10
61 60 58
P0 P0 P1
6 7 1
6 63 59
9
P0 5 P0 4 P1 0
8
6 65 66
P0 3 P0 2 P0
1
6 68 69
7
P0 0 P10 7 P10 6
7 71
(11)
6
P10 P10 (Vss)*
5 4
5 7 73 72
P10 P10 P10
1 2 3
7 76 75
4
Vref P10 0 AVss
7 79 4
3
AVcc P9 P9
7 1
8 2 5
2
P9 6 P9 3 P9 0
1 3 6
1
P9 5 P9 2 CNVss
page 378
f o 3 8 5
CC
M16C/28 Group
VSS VCC
Connecting Pattern
Bypass Capacitor
D E F G H
55 52 50 47 44
P1 P1 P2 P2 P2
4 7 1 4 7
56 53 51 48 45
P1 3 P1 6 P2 0 P2 3 P2 6
57 54 (11) 49 46
P1 2 P1 5 (Vss)* P2 2 P2 5
37
P3 2
34
P3
5
(11)
(Vss)*
29
(11)
(Vss)* P6 6
9 11 14 17 26
RESET Vss P8 P8 P7
5 2 1
7 12 13 16 19
Vcc P8 3 P8 0
P8 /XCIN XIN
7
8 10 13 15 18
XOUT Vcc P8 4 P8 1
P8 /XCOUT
6
and V pins using the shortest and
SS
, X , X , X
IN OUT CIN COUT
J K
42 38
P6 P3
1 1
43 39
P6 0 P3 0
41 40
P6 2 P6 3
36 35
P3 3 P3 4
33 32
P3 P3
6 7
31 30
P6 P6
4 5
28 27
P6 7 P7 0
25 24
P7 P7
2 3
23 22
P7 4 P7 5
21 20
P7 6 P7 7
20. Precautions
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