參數(shù)資料
型號： 37C672
廠商： SMSC Corporation
英文描述： ENHANCED SUPER I/O CONTROLLER WITH FAST IR
中文描述： 增強的超級I / O控制器，快速紅外線
文件頁數(shù)： 58/173頁
文件大?。?/td> 965K
代理商： 37C672
3802 GROUP USER’S MANUAL
3-24
APPENDIX
3.3 Notes on use
(2) AVSS pin
Connect a power source for the A-D converter, AVSS pin to the VSS line of the analog circuit.
(3) A clock frequency during an 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. Thus, make sure the following during an A-D conversion.
q f(XIN) is 500 kHz or more .
(When the ONW pin is "L", f(XIN) is 1 MHz or more.)
q Do not execute the STP instruction and WIT instruction.
3.3.4 Notes on the RESET pin
When a rising time of the reset signal is long, connect a ceramic capacitor or others across the RESET pin and
the VSS pin. And use a 1000 pF or more capacitor for high frequency use. When connecting the capacitor, make
sure the following :
qMake the length of the wiring which is connected to a capacitor the shortest possible.
qMake sure to check the operation of application products on the user side.
Reason
If the several nanosecond or several ten nanosecond impulse noise enters the RESET pin, a microcomputer may
malfunction.
3.3.5 Notes on input and output pins
(1) Fix of a port input level in stand-by state
Fix input levels of an input and an I/O port for getting effect of low-power dissipation in stand-by state, especially
for the I/O ports of the N-channel open-drain.
Pull-up (connect the port to VCC) or pull-down (connect the port to VSS) these ports through a resistor.
When determining a resistance value, make sure the following:
qExternal circuit
qVariation of output levels during the ordinary operation
* stand-by state : the stop mode by executing the STP instruction
the wait mode by executing the WIT instruction
Reason
Even when setting as an output port with its direction register, in the following state :
qN-channel......when the content of the port latch is “1”
the transistor becomes the OFF state, which causes the ports to be the high-impedance state. Make sure that the
level becomes “undefined” depending on external circuits.
Accordingly, the potential which is input to the input buffer in a microcomputer is unstable in the state that input
levels of an input and an I/O port are “undefined.” This may cause power source current.
(2) Modify of the content of I/O port latch
When the content of the port latch of an I/O port is modified with the bit managing instruction*, the value of the
unspecified bit may be changed.
Reason
The bit managing instruction is read-modify-write instruction for reading and writing data by a byte unit.
Accordingly, when this instruction is executed on one bit of the port latch of an I/O port, the following is executed
to all bits of the port latch.
qAs for a bit which is set as an input port : The pin state is read in the CPU, and is written to this bit after bit
managing.
qAs for a bit which is set as an output port : The bit value is read in the CPU, and is written to this bit after bit
managing.
相關(guān)PDF資料
PDF描述
37C67X ENHANCED SUPER I/O CONTROLLER WITH FAST IR
37C957FR ULTRA I/O CONTROLLER FOR PORTABLE APPLICATIONS
37FMA1-ABW31N SPECIAL SWITCH-PIEZO SWITCH, SPST, MOMENTARY, 0.2A, 24VDC, PANEL MOUNT-THREADED
37FML1-BEW31N SPECIAL SWITCH-PIEZO SWITCH, SPST, MOMENTARY, 0.2A, 24VDC, PANEL MOUNT-THREADED
37FML2-ACW21N SPECIAL SWITCH-PIEZO SWITCH, SPST, MOMENTARY, 1A, 24VDC, PANEL MOUNT-THREADED
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
37C67X 制造商:SMSC 制造商全稱:SMSC 功能描述:ENHANCED SUPER I/O CONTROLLER WITH FAST IR
37C-6BH-5-5 制造商:Birtcher Products 功能描述:
37C72U-185 制造商:White-Rodgers 功能描述:
37C73U-170 制造商:White-Rodgers 功能描述:
37C73U-171 制造商:White-Rodgers 功能描述:
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*