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參數(shù)資料
| 型號(hào)： | M34556G8HFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDSO42 |
| 封裝： | 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42 |
| 文件頁(yè)數(shù)： | 104/145頁(yè) |
| 文件大?。?/td> | 1066K |
| 代理商： | M34556G8HFP |
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Rev.3.02
Dec 22, 2006
page 61 of 142
REJ03B0025-0302
4556 Group
Fig. 57 Bypass capacitor across the VSS line and the VDD line
2. Connection of bypass capacitor across VSS line and VDD line
Connect an approximately 0.1
F bypass capacitor across the VSS
line and the VDD line as follows:
Connect a bypass capacitor across the VSS pin and the VDD pin
at equal length.
Connect a bypass capacitor across the VSS pin and the VDD pin
with the shortest possible wiring.
Use lines with a larger diameter than other signal lines for VSS
line and VDD line.
Connect the power source wiring via a bypass capacitor to the
VSS pin and the VDD pin.
VSS
VDD
VSS
VDD
N.G.
O.K.
(3) Wiring to CNVSS pin
Connect CNVSS pin to a GND pattern at the shortest distance.
The GND pattern is required to be as close as possible to the GND
supplied to VSS.
In order to improve the noise reduction, to connect a 5 k
resistor
serially to the CNVSS pin - GND line may be valid.
As well as the above-mentioned, in this case, connect to a GND
pattern at the shortest distance. The GND pattern is required to be
as close as possible to the GND supplied to VSS.
<Reason>
The CNVSS pin of the One Time PROM is the power source input
pin for the built-in One Time PROM. When programming in the
built-in One Time PROM, the impedance of the CNVSS pin is low to
allow the electric current for writing flow into the One Time PROM.
Because of this, noise can enter easily. If noise enters the CNVSS
pin, abnormal instruction codes or data are read from the built-in
One Time PROM, which may cause a program runaway.
Fig. 56 Wiring for the CNVSS pin of the One Time PROM
About 5k
VSS
The shortest
CNVSS
(Note)
Note: This indicates pin.
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| M34556M4H-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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| M34556M8-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34556MXH-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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