參數(shù)資料
型號(hào)： MB90F428GPF
元件分類(lèi)： 微控制器/微處理器
英文描述： 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP100
封裝： PLASTIC, QFP-100
文件頁(yè)數(shù)： 6/99頁(yè)
文件大?。?/td> 1714K
代理商： MB90F428GPF
MB90420G/5G (A) Series
14
Use of external clock signals
Even when an external clock is used, a stabilization period is required following a power-on reset or release
from sub clock mode or stop mode. Also, when an external clock is used it should drive only the X0 pin and the
X1 pin should be left open, as shown in Figure 3.
Power supply pins
Devices are designed to prevent problems such as latchup when multiple VCC and VSS supply pins are used, by
providing internal connections between pins having the same potential. However, in order to reduce unwanted
radiation, and to prevent abnormal operation of strobe signals due to rise in ground level, and to maintain total
output current ratings, all such pins should always be connected externally to power supplies and ground.
As shown in Figure 4, all VCC power supply pins must have the same potential. All VSS power supply pins should
be handled in the same way. If there are multiple VCC or VSS systems, the device will not operate properly even
within the warranted operating range.
In addition, care must be given to connecting the VCC and VSS pins of this device to a current source with as little
impedance as possible. It is recommended that a bypass capacitor of 1.0
F be connected between VCC and
VSS as close to the pins as possible.
Proper sequence of A/D converter power supply analog input
A/D converter power (AVCC, AVRH) and analog input (AN0-AN7) must be applied after the digital power supply
(VCC) is switched on. When power is shut off, the A/D converter power supply and analog input must be cut off
before the digital power supply is switched on (VCC) . In both power-on and shut-off, care should be taken that
AVRH does not exceed AVCC. Even when pins which double as analog input pins are used as input ports, be
sure that the input voltage does not exceed AVCC. (There is no problem if analog power supplies and digital
power supplies are turned off and on at the same time.)
X0
X1
OPEN
MB90420G/425G (A) Series
Sample external clock connection
VCC
VSS
Power supply input pins (VCC/VSS)
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