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參數(shù)資料
| 型號(hào)： | 38D5 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁(yè)數(shù)： | 95/141頁(yè) |
| 文件大小： | 2027K |
| 代理商： | 38D5 |
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Rev.3.01
REJ03B0158-0301
Aug 08, 2007
Page 95 of 134
38D5 Group
Countermeasures against noise
(1) Shortest wiring length
1.Wiring for RESET pin
Make the length of wiring which is connected to the RESET
pin as short as possible. Especially, connect a capacitor across
the RESET pin and the V
SS
pin with the shortest possible
wiring (within 20 mm).
Reason
The width of a pulse input into the RESET pin is determined by
the timing necessary conditions. If noise having a shorter pulse
width than the standard is input to the RESET pin, the reset is
released before the internal state of the microcomputer is
completely initialized. This may cause a program runaway.
Fig. 91 Wiring for the RESET pin
2.Wiring for clock input/output pins
Make the length of wiring which is connected to clock I/O
pins as short as possible.
Make the length of wiring (within 20 mm) across the
grounding lead of a capacitor which is connected to an
oscillator and the V
SS
pin of a microcomputer as short as
possible.
Separate the V
SS
pattern only for oscillation from other V
SS
patterns.
Reason
If noise enters clock I/O pins, clock waveforms may be
deformed.
This may cause a program failure or program runaway. Also, if a
potential difference is caused by the noise between the V
SS
level
of a microcomputer and the V
SS
level of an oscillator, the correct
clock will not be input in the microcomputer.
Fig. 92 Wiring for clock I/O pins
(2) Connection of bypass capacitor across V
SS
line and V
CC
line
In order to stabilize the system operation and avoid the latch-up,
connect an approximately 0.1
μ
F bypass capacitor across the V
SS
line and the V
CC
line as follows:
Connect a bypass capacitor across the V
SS
pin and the V
CC
pin
at equal length.
Connect a bypass capacitor across the V
SS
pin and the V
CC
pin
with the shortest possible wiring.
Use lines with a larger diameter than other signal lines for V
SS
line and V
CC
line.
Connect the power source wiring via a bypass capacitor to the
V
SS
pin and the V
CC
pin.
Fig. 93 Bypass capacitor across the V
SS
line and the V
CC
line
RESET
Reset
circuit
Noise
V
SS
V
SS
N.G.
Reset
circuit
V
SS
RESET
V
SS
O.K.
Noise
X
IN
X
OUT
V
SS
N.G.
X
IN
X
OUT
V
SS
O.K.
V
SS
V
CC
V
SS
V
CC
N.G.
O.K.
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