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參數(shù)資料
| 型號： | TS80L186EC13 |
| 英文描述： | MICROPROCESSOR|16-BIT|CMOS|QFP|100PIN|PLASTIC |
| 中文描述： | 微處理器| 16位|的CMOS | QFP封裝| 100引腳|塑料 |
| 文件頁數(shù)： | 40/57頁 |
| 文件大?。?/td> | 585K |
| 代理商： | TS80L186EC13 |
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80C186EC/188EC, 80L186EC/188EC
DERATING CURVES
272434–13
Figure 14. Typical Output Delay Variations versus Load Capacitance
272434–14
Figure 15. Typical Rise and Fall Variations versus Load Capacitance
RESET
The processor will perform a reset operation any
time the RESIN pin is active. The RESIN pin is syn-
chronized before it is presented internally, which
means that the clock must be operating before a
reset can take effect. From a power-on state, RESIN
must be held active (low) in order to guarantee cor-
rect initialization of the processor.
Failure to pro-
vide RESIN while the device is powering up will
result in unspecified operation of the device.
Figure 16 shows the correct reset sequence when
first applying power to the processor. An external
clock connected to CLKIN must not exceed the V
CC
threshold being applied to the processor. This is nor-
mally not a problem if the clock driver is supplied
with the same V
CC
that supplies the processor.
When attaching a crystal to the device, RESIN must
remain active until both V
CC
and CLKOUT are stable
(the length of time is application specific and de-
pends on the startup characteristics of the crystal
circuit). The RESIN pin is designed to operate cor-
rectly using a RC reset circuit, but the designer must
ensure that the ramp time for V
CC
is not so long that
RESIN is never sampled at a logic low level when
V
CC
reaches minimum operating conditions.
Figure 17 shows the timing sequence when RESIN
is applied after V
CC
is stable and the device has
been operating. Note that a reset will terminate all
activity and return the processor to a known operat-
ing state. Any bus operation that is in progress at the
time RESIN is asserted will terminate immediately
(note that most control signals will be driven to their
inactive state first before floating).
While
A19/S16/ONCE and A18:16 are configured as in-
puts and weakly held high by internal pullup transis-
tors. Only A19/ONCE can be overdriven to a low
and is used to enable the ONCE Mode. Forcing
LOCK or A18:16 low at any time while RESIN is low
is prohibited and will cause unspecified device oper-
ation.
RESIN
is
active,
bus
signals
LOCK,
40
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