參數(shù)資料
型號(hào)： M37549G3-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24
封裝： 5.30 X 10.10 MM, 0.80 MM PITCH, PLASTIC, SSOP-24
文件頁(yè)數(shù)： 77/84頁(yè)
文件大?。?/td> 1378K
代理商： M37549G3-XXXFP
Rev.2.02
Mar 31, 2009
Page 79 of 81
REJ03B0202-0202
7549 Group
Notes on Serial I/O
Notes on A/D conversion
1. Analog input pin
Make the signal source impedance for analog input low, or equip
an analog input pin with an external capacitor of 0.01
F to 1F.
Further, be sure to verify the operation of application products on
the user side.
<Reason>
An analog input pin includes the capacitor for analog voltage
comparison.
Accordingly, when signals from signal source with high
impedance are input to an analog input pin, charge and discharge
noise generates. This may cause the A/D conversion/comparison
precision to be worse.
2. Clock frequency during A/D conversion
The comparator consists of a capacity coupling, and a charge of
the capacity will be lost if the clock frequency is too low. This
m ay cause the A/D conversion precision to be worse.
Accordingly, set f(XIN) in order that the A/D conversion clock is
250 kHz or over during A/D conversion.
3. Read A/D conversion register
8-bit read
Read only the A/D conversion low-order register (address 3516).
10-bit read
Read the A/D conversion high-order register (address 3616) first,
and then, read the A/D conversion low-order register (address
3516).
In this case, the high-order 6 bits of address 3616 returns “0”
when read.
4. A/D translation accuracy
相關(guān)PDF資料
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參數(shù)描述
M37549RLSS 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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M37560E1D-XXXGP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M37560E2D-XXXFP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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