EM78R911 Ver la hoja de datos (PDF) - ELAN Microelectronics
Número de pieza
componentes Descripción
Fabricante
EM78R911 Datasheet PDF : 37 Pages
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EM78911
8-bit micro-controller
* The relation between Bit0 to Bit3 is shown in Fig.6.
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
FSK decoder
begin its work
DATA transfer
to Micro
STATE Diagram between 8-bit
and FSK decoder
SLEEP MODE
Begin
set /FSKPWR='0'
No
/RINGTIME ='0'
or external keys
pressed
Yes
WAKE UP MODE
8-bit wake up and
set /FSKPWR='1'
accept data from
FSK decoder
Yes /RD and /CD ='1'
No
data end and 30
sec nothing to do.
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 VDD voltage is under low power range (controlled by IOCA bit0) then sends a '0' signal to
/LOW_BAT bit or 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
s2
1 on
0 off
1 on
Vref
/POVD
/LPD
1 on
+
-
to Low bat
To reset
s2
1 on
0 off
/LPD
Fig7. The relation between /LPD,/POVD
* Bit6(read/write)(PLL enable signal)
0/1=DISABLE/ENABLE
The relation between 32.768K and 3.579M can see Fig8.
S u b -c lo c k
3 2 .7 6 8 K H z
PLL
3 .5 7 9 M H z
R A b it6
1
sw itc h
0
T o sy ste m clo c k
Fig8. The relation between 32.768K and 3.579K .
8
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