em78p811 ELAN Microelectronics Corp, em78p811 Datasheet - Page 13

• Manufacturer Part Number: em78p811
• Description: 8-bit Micro-controller
• Manufacturer: ELAN Microelectronics Corp

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* This specification is subject to be changed without notice.
* Bit0 (Read Only) (Ring detect signal)
* Bit1(Read Only)(Carrier detect signal) 0/1 : Carrier Valid/Carrier Invalid
* Bit2(Read Only)(FSK demodulator output signal)
* Bit3(read/write)(FSK block power up signal)
* The relation between Bit0 to Bit3 is shown in Fig.6.
* Bit4(Read Only)(Low battery signal)
* 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.
* Bit6(read/write)(PLL enable signal)
If the battery voltage is under 4.2V then sends a '0' signal to RA register bit4 or a '1' signal to this Bit:.
0/1=DISABLE/ENABLE
The relation between 32.768K and 3.679M can see Fig8.
IDLE
7
Fsk data transmitted in a baud rate 1200 Hz. Data from FSK demodulator when /CD is low.
1/0 : FSK demodulator block power up/FSK demodulator power down
/358E
6
/LPD /LOW_BAT /FSKPWR
5
FSK decoder
begin its work
/RD and /CD ='1'
Vdd
sleep mode
STATE Diagram between 8-bit
and FSK decoder
s2
1 on
0 off
s2
1 on
0 off
4
Fig6. The relation between Bit0 to Bit3.
1 on
/RD and /CD ='1' and
nothing to do for 30
sec , /FSKPWR='0'
/FSKPWR='1'
Fig7. The relation between /LPD,/POVD
0/1 : Ring Valid/Ring Invalid
Vref
0/1 = Battery voltage is low/Normal .
DATA transfer
to Micro
/RINGTIME ='0'
or external keys
pressed
3
+
-
12
1 on
wake up
mode
/POVD
/LPD
DATA
2
Flow Diagram between 8-bit
and FSK decoder
Yes
No
/RD and /CD ='1'
data end and 30
sec nothing to do.
/CD
WAKE UP MODE
8-bit wake up and
set /FSKPWR='1'
accept data from
FSK decoder
/RINGTIME ='0'
or external keys
pressed
1
SLEEP MODE
Begin
set /FSKPWR='0'
to Low bat
Yes
/RD
8-bit OTP Micro-controller
0
/LPD
To reset
No
EM78P811