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參數(shù)資料
| 型號： | LC6529F |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | 4-Bit Microcomputer for Small-Scale Control Applications |
| 中文描述： | 4小位微機控制應(yīng)用規(guī)模 |
| 文件頁數(shù)： | 38/39頁 |
| 文件大小： | 525K |
| 代理商： | LC6529F |
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— Waveforms during operation
Figure 2-5 gives the waveforms relevant to the operation of the above circuit. There are three main states: (a)
power-on reset sequence, (b) momentary break in main power supply, and (c) recovery from power outage
backup state.
Note: V
+TR1ON
= V
+
level at which transistor TR1 switches on and off
V
+TR3ON
= V
+
level at which transistor TR3 switches on and off
Figure 2-5 Waveforms Relevant to Operation of Circuit Example 3
— Main circuit states
a: Power-on reset sequence
The operation and points to watch are the same as for the second example.
b: Momentary break in main power supply
i.
If only the RES pin and none of the Pxx pins drops below the threshold level V
IL
, the chip resets. If
the recovery routine then finds that Pxx is high, it switches to a separate routine for restarting after a
power outage.
ii.
If the RES pin and the Pxx pins remain above the threshold level V
IL
, the chip continues normal
execution.
iii. If both the RES pin and the Pxx pins drop below the threshold level V
IL
, the chip resets if two
consecutive polls fail to detect a low at Pxx or, if a low is found, enters the HALT mode and then,
because the power has been restored, leaves the HALT mode. If the recovery routine then finds that
Pxx is high, it switches to a separate routine for restarting after a power outage.
c: Recovery from power outage backup state
The operation and points to watch are the same as for the second example.
— Design considerations
a: R3 value
This serves as the bias resistor for transistor TR2.
b: R7 and R8 values
Select these so that transistor TR3 switches on and off at approximately 1.5 V.
In all other respects, the same considerations apply as in Example 1.
— Software considerations
The same considerations apply as in Example 1.
No. 5117-38/39
LC6529N, LC6529F, LC6529L
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