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參數(shù)資料
| 型號： | MB90P653APF |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-bit Proprietary Microcontroller |
| 中文描述： | 16-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | PLASTIC, QFP-100 |
| 文件頁數(shù)： | 17/120頁 |
| 文件大小： | 1690K |
| 代理商： | MB90P653APF |
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17
MB90650A Series
8. Initializing
In this device there are some kinds of inner resisters which are initializid only by power on reset. It is possible
to initialize these resisters by turning on the power supply again.
9. Power Supply Pins
When there are several V
CC
and V
SS
pins, those pins that should have the same electric potential are connected
within the device when the device is designed in order to prevent misoperation, such as latchup. However, all
of those pins must be connected to the power supply and ground externally in order to reduce unnecessary
emissions, prevent misoperation of strobe signals due to an increase in the ground level, and to observe the
total output current standards.
In addition, give a due consideration to the connection in that current supply be connected to V
CC
and V
SS
with
the lowest possible impedance.
Finally, it is recommended to connect a capacitor of about 0.1
μ
F between V
CC
and V
SS
near this device as a
bypass capacitor.
10.Crystal Oscillation Circuit
Noise in the vicinity of the X0 and X1 pins will cause this device to operate incorrectly. Design the printed circuit
board so that the bypass capacitor connecting X0, X1 and the crystal oscillator (or ceramic oscillator) to ground
is located as close to the device as possible, and that the wiring does not closs the other wirings.
In addition, because printed circuit board artwork in which the area around the X0 and X1 pins is surrounded
by ground provides stable operation, such an arrangement is strongly recommended.
11. About 2 Power Supplies
The MB90650A series usually uses the 3-V power supply as the main power source. With Vcc1 = 3 V and Vcc2
= 5 V, however, it can interface with P20 to P27, P30 to P37, P40 to P47, and P70 to P72 for the 5-V power
supply separately from the 3-V power supply. Note, however, that the analog power supplies such as A/D and
D/A can be used only as 3-V power supplies.
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