參數(shù)資料
型號(hào)： EM78810
廠商： ELAN Microelctronics Corp .
英文描述： 8-Bit Micro-Controller for Telecom Product(工作電壓2.5V-6V的8位呼叫識(shí)別的RISC型微控制器)
中文描述： 8位微控制器的電信產(chǎn)品（工作電壓為2.5V到6V的8位呼叫識(shí)別的的RISC型微控制器）
文件頁(yè)數(shù)： 20/31頁(yè)
文件大小： 191K
代理商： EM78810
* This specification are subject to be changed without notice.
20
9.30.1997
EM78810
8-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT
Fig15. DTMF Block Diagram
SYSTEM CLOCK
DTMF low-freq
selection
DTMF high-freq
selection
Sine wave
generator
Sine wave
generator
Adder
ROW
Register
COLUMN
Register
Low frequency generator
High frequency generator
DTMF tone
output
- 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. If RB is set by ineffective value, the DTMF
output will be disable and there is no tone output.
. Bit 7 ~ 0 are all “1” , turn off DTMF power .
bit 3~0
1110
1101
1011
0111
Column freq
bit 7~4
Row freq
699.2Hz
771.6Hz
854Hz
940.1Hz
Xin=3.58MHz
1
4
7
*
1203Hz
1110
2
5
8
0
1331.8Hz
1101
3
6
9
#
1472Hz
1011
A
B
C
D
1645.2Hz
0111
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 RC and RD.
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