參數(shù)資料
型號(hào)： MB90P634A
廠商： Fujitsu Limited
英文描述： 16-bit Proprietary Microcontroller
中文描述： 16位微控制器專有
文件頁(yè)數(shù)： 14/107頁(yè)
文件大?。?/td> 1589K
代理商： MB90P634A
14
MB90630A Series
I
HANDLING DEVICES
1. Preventing Latch-up
Latch-up occurs in a CMOS IC if a voltage greater than V
CC
or less than V
SS
is applied to an input or output pin
or if the voltage applied between V
CC
and V
SS
exceeds the rating. If latch-up occurs, the power supply current
increases rapidly resulting in thermal damage to circuit elements. Therefore, ensure that maximum ratings are
not exceeded in circuit operation.
For the same reason, also ensure that the analog supply voltage does not exceed the digital supply voltage.
2. Treatment of Unused Pins
Leaving unused input pins unconnected can cause misoperation. Always pull-up or pull-down unused pins.
3. External Reset Input
To reliably reset the controller by inputting an “L” level to the RST pin, ensure that the “L” level is applied for at
least five machine cycles. Take particular note when using an external clock input.
4. V
CC
and V
SS
Pins
Ensure that all V
CC
pins are at the same voltage. The same applies for the V
SS
pins.
5. Precautions when Using an External Clock
Drive the X0 pin only when using an external clock.
6. A/D Converter Power Supply and the Turn-on Sequence for Analog Inputs
Always turn off the A/D converter power supply (AV
CC
, AVRH, AVRL) and analog inputs (AN0 to AN7) before
turning off the digital power supply (V
CC
).
When turning the power on or off, ensure that AVRH does not exceed AV
CC
.
Also, when using the analog input pins as input ports, ensure that the input voltage does not exceed AV
CC
.
7. Program Mode
All bits (64 K
×
16 bits) in the MB90P634A are “1” on delivery from Fujitsu or after erasing. To write data,
selectively program the desired bits to “0”. The value “1” cannot be written electrically.
X0
X1
MB90630A
Using an external clock
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