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參數(shù)資料
| 型號： | MB90P214A |
| 廠商： | Fujitsu Limited |
| 英文描述： | 8-Bit Proprietary Microcontroller(8位專用微控制器) |
| 中文描述： | 8位微控制器專利（8位專用微控制器） |
| 文件頁數(shù)： | 17/99頁 |
| 文件大小： | 932K |
| 代理商： | MB90P214A |
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17
MB90210 Series
I
HANDLING DEVICES
1. Preventing Latchup
CMOS ICs may cause latchup when a voltage higher than V
CC
or lower than V
SS
is applied to input or output
pins, or when a voltage exceeding the rating is applied between V
CC
and V
SS
.
If latch-up occurs, the power supply current increases rapidly, sometimes resulting in thermal breakdown of the
device. Use meticulous care not to let any voltage exceed the maximum rating.
Also, take care to prevent the analog power supply (AV
CC
and AVRH) and analog input from exceeding the digital
power supply (V
CC
) when the analog system power supply is turned on and off.
2. Treatment of Unused Input Pins
Leaving unused input pins open could cause malfunctions. They should be connected to a pull-up or pull-down
resistor.
3. Treatment of Pins when A/D is not Used
Connect to be AV
CC
= AVRH = V
CC
and AV
SS
= AVRL = V
SS
even if the A/D converter is not in use.
4. Precautions when Using an External Clock
To reset the internal circuit properly by the Low-level input to the RST pin, the “L” level input to the RST pin
must be maintained for at least five machine cycles. Pay attention to it if the chip uses external clock input.
5. V
CC
and V
SS
Pins
Apply equal potential to the V
CC
and V
SS
pins.
6. Notes on Using an External Clock
When using an external clock, drive the X0 pin as illustrated below. When an external clock is used, oscillation
stabilization time is required even for power-on reset and wake-up from stop mode.
7. Power-on Sequence for A/D Converter Power Supplies and Analog Inputs
Be sure to turn on the digital power supply (V
CC
) before applying voltage to the A/D converter power supplies
(AV
CC
, AVRH, and AVRL) and analog inputs (AN0 to AN7).
When turning power supplies off, turn off the A/D converter power supplies (AV
CC
, AVRH, and AVRL) and analog
inputs (AN0 to AN7) first, then the digital power supply (V
CC
).
When turning AVRH on or off, be careful not to let it exceed AV
CC
.
X0
X1
MB90210
Note: When using an external clock, be sure to input external clock more than 6 machine cycles after
setting the HST pin to “L” to transfer to the hardware standby mode.
Use of External Clock
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