參數(shù)資料
型號(hào)： FR65E
廠商： Fujitsu Limited
英文描述： 32-Bit Microcontroller
中文描述： 32位微控制器
文件頁(yè)數(shù)： 14/87頁(yè)
文件大?。?/td> 369K
代理商： FR65E
MB91307B
14
I
HANDLING DEVICES
H
MB91307 Series
Preventing Latchup
When CMOS integrated circuit devices are subjected to applied voltages higher than V
cc
at input and output pins
(other than medium- and high-withstand voltage pins), or to voltages lower than V
ss
, as well as when voltages
in excess of rated levels are applied between V
cc
and V
ss
, a phenomenon known as latchup can occur. When a
latchup condition occurs, supply current can increase dramatically and may destroy semiconductor elements.
In using semiconductor devices, always take sufficient care to avoid exceeding maximum ratings.
Treatment of unused input pins
If unused input pins are left open, abnormal operation may result. Any unused input pins should be connected
to pull-up or pull-down resistance.
Power supply pins
Devices are designed to prevent problems such as latchup when multiple V
cc
and V
ss
supply pins are used, by
providing internal connections between pins having the same potential. However, in order to reduce unwanted
radiation, 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. Also, care
must be given to connecting the V
cc
and V
ss
pins of this device to a current source with as little impedance as
possible.
In addition, it is recommended that a bypass capacitor of 1.0
μ
F be connected between V
cc
and V
ss
as close to
the pins as possible.
Crystal oscillators
Noise in proximity to the X0 and X1 pins can cause abnormal operation in this device. Printed circuit boards
should be designed so that the X0 and X1 pins, and oscillators (or crystal oscillators), as well as bypass capacitors
connected to ground, are placed as close together as possible.
The use of printed circuit board architecture in which the X0 and X1 pins are surrounded by ground contributes
to stable operation and is strongly recommended.
Treatment of NC pins
Any pins marked “NC” (not connected) must be left open.
Mode pins (MD0-MD2)
These pins should be used in direct connection to V
cc
or V
ss
. To prevent noise from causing the device to
erroneously switch into test mode, the printed circuit board design should allow the shortest possible pattern
length between mode pins and V
cc
or V
ss
, and the connection should have as little impedance as possible.
Operation at startup
Immediately after a power-on startup, always apply a reset initialization (INIT) at the INIT pin. Also, in order to
assure a wait period for the oscillator circuits to stabilize immediately after startup, be sure that the “L” level input
to the INIT pin continues for the required stabilization wait interval. (The INIT cycle for the INIT pin includes only
the minimum setting for the stabilization wait period.)
Base oscillator input at startup
At power-on startup, always input a clock signal until the oscillator stabilization wait period is ended.
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