參數(shù)資料
型號： M38039M5-XXXSP
廠商： Renesas Technology Corp.
英文描述： 9-Mbit (256K x 36/512K x 18) Pipelined DCD Sync SRAM; Architecture: Standard Sync, Pipeline DCD; Density: 9 Mb; Organization: 256Kb x 36; Vcc (V): 3.1 to 3.6 V
中文描述： 單芯片8位CMOS微機
文件頁數(shù)： 93/119頁
文件大小： 1575K
代理商： M38039M5-XXXSP
Rev.1.00
REJ03B0212-0100
Apr 2, 2007
Page 93 of 117
3803 Group (Spec.L)
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 20mm).
<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 com-
pletely initialized. This may cause a program runaway.
Fig 90. 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
pat-terns.
<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 91. 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 92. 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.
相關(guān)PDF資料
PDF描述
M38039M5-XXXWG SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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