EM78811 Ver la hoja de datos (PDF) - ELAN Microelectronics
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EM78811 Datasheet PDF : 33 Pages
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EM78811
8-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT
sleep mode
/RINGTIME='0'
or EXTERNAL KEYS
PRESSED
/RD and /CD ='1'
/RD and /CD ='1' and
nothing to do for 30
sec , /FSKPWR='0'
/FSKPWR='1'
wake up
mode
SLEEP MODE
Begin
set /FSKPWR='0'
No /RINGTIME ='0'
or external keys
pressed
Yes
WAKE UP MODE
8-bit wake up andÁ
set /FSKPWR='1'
accept data from
FSK decoder
FSK decoder
begin its work
DATA transfer
DATA transfer
to Micro
Yes /RD and /CD ='1' No
data end and 30
sec nothing to do.
STATE Diagram between 8-bit
and FSK decoder
Flow Diagram between 8-bit
and FSK decoder
Fig6. The relation between Bit0 to Bit3.
• Bit4(Read Only)(Low battery signal)
0/1 = Battery voltage is low/Normal . If the battery voltage is under 3.6V then sends a ‘0’ signal to RA register
bit4 or sends a '1' signal to this bit.
• Bit5(read/Write)(Low battery detect enable)
0/1 = low battery detect DISABLE/ENABLE. The relation between /LPD,/POVD and /LOW_BAT can see
Fig7.
Vdd
/POVD
s2
/LPD
1 on
0 off
1 on
+
-
1 on
to Low bat
To reset
Vref
s2
1 on
/LPD
0 off
Fig7. The relation between /LPD,/POVD
• Bit6(read/write)(PLL enable signal)
0/1=DISABLE/ENABLE, The relation between 32.768K and 3.679M can see Fig8.
32.768K
PLL
3.679M
/358E
1
switch
0
To system clock
Fig8. The relation between 32.768K and 3.58K .
* This specification are subject to be changed without notice.
10.12.1998 8
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