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| 型号： | M38030F8L-XXXWG |
| 厂商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 单芯片8位CMOS微机 |
| 文件页数： | 113/119页 |
| 文件大小： | 1575K |
| 代理商： | M38030F8L-XXXWG |
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Rev.1.00
Apr 2, 2007
Page 93 of 117
REJ03B0212-0100
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 VSS 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 VSS pin of a microcomputer as short as
possible.
Separate the VSS pattern only for oscillation from other VSS
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 VSS level of a microcomputer and the VSS 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 VSS line and VCC line
In order to stabilize the system operation and avoid the latch-up,
connect an approximately 0.1
F bypass capacitor across the VSS
line and the VCC line as follows:
Connect a bypass capacitor across the VSS pin and the VCC pin
at equal length.
Connect a bypass capacitor across the VSS pin and the VCC pin
with the shortest possible wiring.
Use lines with a larger diameter than other signal lines for VSS
line and VCC line.
Connect the power source wiring via a bypass capacitor to the
VSS pin and the VCC pin.
Fig 92. Bypass capacitor across the VSS line and the
VCC line
RESET
Reset
circuit
Noise
VSS
N.G.
Reset
circuit
VSS
RESET
VSS
O.K.
Noise
XIN
XOUT
VSS
N.G.
XIN
XOUT
VSS
O.K.
VSS
VCC
VSS
VCC
N.G.
O.K.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M38037M5H-175HP#U0 | 制造商:Renesas Electronics Corporation 功能描述:8BIT CISC - Trays |
| M38037M8108F | 制造商:Panasonic Industrial Company 功能描述:IC |
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| M38039FFHHP | 功能描述:MCU 3/5V 56K+4K 64-LQFP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 标准包装:250 系列:56F8xxx 核心处理器:56800E 芯体尺寸:16-位 速度:60MHz 连通性:CAN，SCI，SPI 外围设备:POR，PWM，温度传感器，WDT 输入/输出数:21 程序存储器容量:40KB（20K x 16） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:6K x 16 电压 - 电源 (Vcc/Vdd):2.25 V ~ 3.6 V 数据转换器:A/D 6x12b 振荡器型:内部 工作温度:-40°C ~ 125°C 封装/外壳:48-LQFP 包装:托盘 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
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