EM91401CP

Manufacturer Part NumberEM91401CP
DescriptionTone/pulse switchable dialer with LCD interface and dual tone melody generator
ManufacturerELAN Microelectronics Corp
EM91401CP datasheet
 


1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
18
19
20
21
22
23
Page 8/23:

SDO (Serial Data Output) function

Download datasheet (175Kb)Embed
PrevNext

SDO (Serial Data Output) function

The SDO is serial data output which format is same as UART protocol. SDO function is designed to drive LCD
driver and voice synthesizer. So the dialing numbers can be display on LCD screen with EM32100 (or EM32116
). The SDO signal consists of two start bits, six data bits and two stop bits. Each bit time is about 3.9 ms (256 Hz)
and output sequences are following by start bits, data bits (LSB to MSB) and stop bits.
1
0
start bits
ready
SDO Keypad Encoded table:
Digital key (b5,b4=0,0)
keypad
1
2
3
output
b3,b2,b1,b0 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110
Display
1
2
3
Function key (b5,b4=1,0)
keypad
F
output
b3,b2,b1,b0
1111
Display
clear all display
Keypad,SDO format and LCD display reference table:
Keypad
bit5
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
0
9
0
0
0
“*”/T
0
#
0
P
0
*/”T”
0
F
1
LOCK function
The EM91401 serial provides the LOCK function to inhibit toll dialing operation. Connecting a resistor on COL1
* This specification are subject to be changed without notice.
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
bit 0
bit2
bit3
bit4
bit1
data bits
4
5
6
7
8
4
5
6
7
8
bit4
bit3
bit2
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
1
0
0
1
0
1
0
0
1
0
0
1
0
0
1
0
0
1
1
0
1
1
0
1
1
0
1
1
EM91401 SERIES
1
bit5
0
stop bits
9
0
“*”/T
#
P */”T”
9
0
P
bit1
bit0
Display
0
1
1
1
0
2
1
1
3
0
0
4
0
1
5
1
0
6
1
1
7
0
0
8
0
1
9
1
0
0
1
1
0
0
0
1
P
1
0
1
1
clear all display
10.1.1997
8