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EM6812F2TP24B 数据表(PDF) 33 Page - EM Microelectronic - MARIN SA

部件名 EM6812F2TP24B
功能描述  Ultra Low Power 8-bit FLASH Microcontroller
PDF  81 Pages
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制造商  EMMICRO [EM Microelectronic - MARIN SA]
网页  http://www.emmicroelectronic.com
标志 EMMICRO - EM Microelectronic - MARIN SA

EM6812F2TP24B 数据表(HTML) 33 Page - EM Microelectronic - MARIN SA

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R
EM6812
Copyright
© 2005, EM Microelectronic-Marin SA
33
www.emmicroelectronic.com
9
Supply Voltage Level Detector (SVLD)
The EM6812 has a built in 8 level supply voltage detector that compares the supply voltage against a predefined voltage
level. The CPU can inspect the result of the comparison, it reads ‘0’ if the supply voltage is higher than the compare level
and ‘1’ if lower.
The lowest compare level is equivalent to the brown out detection level. Obviously this level can only be measured if the
brown out function is switched off. Also the SVLD function is temporarily disabled during Sleep mode.
The internal bandgap reference is shared between the SVLD and the BrownOut function. If active, it will consume an extra
~6µA during the whole measuring time
Figure 19. SVLD architecture
Timings:
- Internal voltage reference settling time:
8ms
(From either EnSVLD=’1’ or EnBrownOut=’1’).
Must be respected when the voltage reference gets switched on.
- Comparator settling time: 10µs
(From EnSVLD=’1’ to 1
st readout)
Must be respected for every measure before reading the result.
Table 27. Analogue configurations register
RegAnaCfg
0x20
Analogue configurations
Bit
Name
Res
Reset by
R/W
Description
7
EnSVLD
0
ResSys
R/W
Enable the SVLD function
6
EnBrownOut
1
POR
R/W
Enable the Brownout function
5
SVLDLevel1
0
ResSys
4
SVLDLevel2
0
ResSys
3
SVLDLevel3
0
ResSys
SVLD level selection (1 out of 8 levels)
2
-
-
-
-
1
-
-
-
-
0
SVLDStatus
0
SVLD result ‘0’ = VDD > SVLD Level
‘1’ = VDD < SVLD Level
Table 28. SVLD selection table
SVLDLevel3
SVLDLevel2
SVLDLevel1
Typical Detection Level
0
0
0
2.0
0
0
1
2.1
0
1
0
2.2
0
1
1
2.3
1
0
0
2.4
1
0
1
2.5
1
1
0
2.6
1
1
1
3.4
Vref = 1.2V
Level1
EnBrownOut
En
Level3
Level4
Level5
Level6
SVLDLevel
selector
Level7
Level2
VDD
SVLDResult
En
EnSVLD
EnSVLD
BrownOut
EnBrownOut
Level8
VSS



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