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參數(shù)資料
| 型號(hào)： | M38198ECFS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, UVPROM, 4.2 MHz, MICROCONTROLLER, CQCC100 |
| 封裝： | CERAMIC, LCC-100 |
| 文件頁(yè)數(shù)： | 96/218頁(yè) |
| 文件大?。?/td> | 2137K |
| 代理商： | M38198ECFS |
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3. APPENDIX
171
MITSUBISHI MICROCOMPUTER
3819 Group
3.1 Notes on use
3819 Group USER’S MANUAL
<Note 3>
The comparator uses internal capacitors whose charge 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 .
q Do not execute the STP instruction and WIT instruction.
3.1.4 Notes on the RESET pin
<Note>
n case where the RESET signal rise time 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, note the
following :
qMake the length of the wiring which is connected to a capacitor.
qBe 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, it may cause a
microcomputer failure.
3.1.5 Notes on input and output pins
<Note 1>
In stand-by state* for low-power dissipation, do not make input levels of an input and an I/O port “undefined,“
especially for the I/O ports of the P-channel and 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, note the following points:
qExternal circuit
qVariation of output levels during the ordinary operation
When using built-in pull-up or pull-down resistor as an option, note on varied current values.
qWhen setting as an input port : Fix its input level
qWhen setting as an output port : Prevent current from flowing out to external
Reason
Even when setting as an output port with its direction register, in the following state :
qP-channel......when the content of the data register (port latch) is “0”
qN-channel......when the content of the data register (port latch) is “1”
the transistor becomes the OFF state, which causes the ports to be the high-impedance state. Note 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.
* stand-by state : the stop mode by executing the STP instruction
the wait mode by executing the WIT instruction
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