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| 型號： | COP8SDR9KMTA8 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-Bit CMOS Flash Based Microcontroller with 32k Memory, Virtual EEPROM and Brownout |
| 中文描述： | 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PDSO56 |
| 封裝： | TSSOP-56 |
| 文件頁數(shù)： | 23/80頁 |
| 文件大小： | 972K |
| 代理商： | COP8SDR9KMTA8 |
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10.0 Functional Description
(Continued)
In Case 1, V
rises from 0V and the on-chip RESET is
undefined until the supply is greater than approximately
1.0V. At this time the brownout circuit becomes active and
holds the device in RESET. As the supply passes a level of
about 1.8V, a delay of about 3 ms (t
) is started and the Idle
Timer is preset to a value between 00F0 and 00FF (hex).
Once V
is greater than V
and t
d
has expired, the Idle
Timer is allowed to count down (t
id
).
Case 2 shows a subsequent dip in the supply voltage which
goes below the approximate 1.8V level. As V
CC
drops below
V
bor
, the internal RESET signal is asserted. When V
CC
rises
back above the 1.8V level, t
d
is started. Since the power
supply rise time is longer for this case, t
d
has expired before
V
CC
rises above V
bor
and t
id
starts immediately when V
CC
is
greater than V
bor
.
Case 3 shows a dip in the supply where V
drops below
V
bor
, but not below 1.8V. On-chip RESET is asserted when
V
goes below V
bor
and t
id
starts as soon as the supply
goes back above V
bor
.
If the Brownout Reset feature is enabled, the internal reset
will not be turned off until the Idle Timer underflows. The
internal reset will perform the same functions as external
reset. The device is guaranteed to operate at the specified
frequency down to the specified brownout voltage. After the
underflow, the logic is designed such that no additional
internal resets occur as long as V
CC
remains above the
brownout voltage.
The device is relatively immune to short duration negative-
going V
transients (glitches). It is essential that good
filtering of V
be done to ensure that the brownout feature
works correctly. Power supply decoupling is vital even in
battery powered systems.
There are two optional brownout voltages. The part numbers
for the three versions of this device are:
COP8SBR9, V
bor
= low voltage range
COP8SCR9, V
bor
= high voltage range
COP8SDR9, BOR is disabled.
Refer to the device specifications for the actual V
bor
volt-
ages.
High brownout voltage devices are guaranteed to operate at
10MHz down to the brownout voltage. Low brownout voltage
devices are guaranteed to operate at 3.33MHz down to the
brownout voltage.
Devices are not guaranteed to operate
at 10MHz down to the low brownout voltage.
Under no circumstances should the RESET pin be allowed
to float. If the on-chip Brownout Reset feature is being used,
the RESET pin should be connected directly to V
CC
. The
RESET input may also be connected to an external pull-up
resistor or to other external circuitry. Any rising edge on the
RESET pin while V
is below the specified operating range
may cause unpredictable results. The output of the brownout
reset detector will always preset the Idle Timer to a value
between 00F0 and 00FF (240 to 256 t
C
). At this time, the
internal reset will be generated.
If the BOR feature is disabled, then no internal resets are
generated and the Idle Timer will power-up with an unknown
value. In this case, the external RESET must be used. When
BOR is disabled, this on-chip circuitry is disabled and draws
no DC current.
The contents of data registers and RAM are unknown fol-
lowing the on-chip reset.
10138913
FIGURE 10. Brownout Reset Operation
C
www.national.com
23
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