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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(jī)控制應(yīng)用規(guī)模 |
| 文件頁數(shù)： | 37/39頁 |
| 文件大?。?/td> | 525K |
| 代理商： | LC6529F |
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— Main circuit states
a: Power-on reset sequence
The operation and points to watch are the same as for the first example. The only difference is that the
software interprets a low at Pxx as indicating an initial reset.
b: Switch to standby operation
The chip polls Pxx and, if it is low, enters the HALT mode.
c: Recovery from power outage backup state
Since the power has been restored, the chip 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.
Caution: If the power supply voltage V
DD
drops below the V
IH
level for Pxx during the outage, this
recovery routine will subsequently find that Pxx is low and execute the routine for an initial reset instead.
— Design considerations
a: R2 and R3 values
Make R2 much greater than R1 and choose R3 to limit TR2’s I
B
.
b: R4 value
Since there are no momentary outages, the value is not critical, but select R4 so that C2 quickly discharges.
In all other respects, the same considerations apply as in Example 1.
— Software considerations
a: Assign signals so that PA3 is maintained high during standby operation.
b: The software should check for a standby request by polling once.
Example:
Example 3
The third example adds support for momentary power outages.
— Circuit diagram
Figure 2-5 gives the circuit diagram for this sample circuit.
Note: All ports other than PA3 are configured as normal input ports.
Figure 2-5 Power Outage Backup Example 3
BP1
HALT
AAA
: Poll port
: Begin standby operation
AAA :
No. 5117-37/39
LC6529N, LC6529F, LC6529L
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