參數(shù)資料
型號： M38D24G4HP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP64
封裝： 10X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù)： 27/138頁
文件大?。?/td> 2880K
代理商： M38D24G4HP
Rev.3.02
Apr 10, 2008
Page 120 of 131
REJ03B0177-0302
38D2 Group
3. Direction Registers
4. Pull-Up Control
Only for the pin set to input mode, pull-up is controlled by the
PULL register and the segment output disable register.
Notes on Termination of Unused Pins
1. Termination of Unused Pins
Perform the following at the shortest possible distance (20 mm or
less) from the MCU pins.
(1) I/O ports
Set the ports to input mode and connect each pin to VCC or VSS
through a resistor of 1 k to 10 k
Ω. An internal pull-up resistor can
also be used for the port where the internal pull-up resister is
selectable.
To set the ports to output mode, leave open at “L” or “H” output.
When setting the ports to output mode and leave open,
input mode in the initial state remains until the mode of the
ports are switched to output mode by a program after a
reset. This may cause the voltage level of the pins to be
undefined and the power source current to increase while
the ports remains in input mode. For any effects on the
system, careful system evaluations should be implemented
on the user side.
The direction registers may be changed due to a program
runaway or noise, so reset the registers periodically by a
program to increase the program reliability.
2. Termination Concerns
(1) When setting I/O ports to input mode
[1] Do not leave open
<Reason>
The power source current may increase depending on the
first-stage circuit.
The ports are more likely affected by noise when compared
with the termination shown on the above “1. (1) I/O ports”
[2] Do not connect to VCC or VSS directly
<Reason>
If the direction registers are changed to output mode due to a
program runaway or noise, a short circuit may occur.
[3] Do not connect multiple ports in a lump to VCC or VSS
through a resistor.
<Reason>
If the direction registers are changed to output mode due to a
program runaway or noise, a short circuit may occur between the
ports.
相關PDF資料
PDF描述
M38D29GC-XXXHP 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP64
M38D24G4-XXXFP 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP64
M38D29GF-XXXHP 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP64
M38D29GFFP 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP64
M38D29GCHP 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP64
相關代理商/技術參數(shù)
參數(shù)描述
M38D24G4HP#U0 功能描述:IC 740/38D2 MCU QZ-ROM 64LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 標準包裝:250 系列:80C 核心處理器:8051 芯體尺寸:8-位 速度:16MHz 連通性:EBI/EMI，I²C，UART/USART 外圍設備:POR，PWM，WDT 輸入/輸出數(shù):40 程序存儲器容量:- 程序存儲器類型:ROMless EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-LCC（J 形引線） 包裝:帶卷 (TR)
M38D24G4XXXFP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M38D24G4XXXHP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M38D24G5XXXFP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M38D24G5XXXHP 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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