EM78R911 View Datasheet(PDF) - ELAN Microelectronics

Part Name

Description

Manufacturer

EM78R911

8-bit micro-controller

ELAN Microelectronics 

EM78911

8-bit micro-controller

Fig15. DTMF Block Diagram

* RB ( DTMF Register )

. Bit 0 - Bit 3 are row-frequency tone.

. Bit 4 - Bit 7 are column-frequency tone.

. Initial RB is equal to HIGH.

. Except below values of RB ,the other values of RB are not effect.

output will be disable and there is no tone output.

. Bit 7 ~ 0 are all "1" , turn off DTMF power .

If RB is set by ineffective value, the DTMF

bit 3~0

1110

1101

1011

0111

Column freq

bit 7~4

Row freq

699.2Hz

771.6Hz

854Hz

940.1Hz

1

4

7

*

1203Hz

1110

2

5

8

0

1331.8Hz

1101

3

6

9

#

1472Hz

1011

A

B

C

D

1645.2Hz

0111

VII.11 LCD Driver

The CALLER ID IC can drive LCD directly and has 60 segments and 16 commons that can drive 60*16 dots

totally. LCD block is made up of LCD driver , display RAM, segment output pins , common output pins and LCD

operating power supply pins.

Duty , bias , the number of segment , the number of common and frame frequency are determined by LCD

mode register . LCD control register.

The basic structure contains a timing control which uses the basic frequency 32.768KHz to generate the proper

timing for different duty and display access. RE register is a command register for LCD driver, the LCD

display( disable, enable, blanking) is controlled by LCD_C and the driving duty and bias is decided by LCD_M and

the display data is stored in data RAM which address and data access controlled by registers IOCB and IOCC.

32.768KHz

LCD timing control

IOCB(address)

IOCC(data)

RAM

RE(LCD_C,LCD_M)

LCD duty control

Bias control

Vdd-Vlcd

LCD COMMON control

COM

Display data control

LCD SEGMENT control

SEG

Fig16. LCD DRIVER CONTROL

24

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