em91401a ELAN Microelectronics Corp, em91401a Datasheet - Page 8

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em91401a

Manufacturer Part Number
em91401a
Description
Em91401 Series Tone/pulse Switchable Dialer With Lcd Interface And Dual-tone Melody Generator Em91401 Series Tone/pulse Switchable Dialer With Lcd Interface And Dual-tone Melody Generator
Manufacturer
ELAN Microelectronics Corp
Datasheet

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* This specification are subject to be changed without notice.
keypad
output
b3,b2,b1,b0 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110
Display
Keypad,SDO format and LCD display reference table:
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.
LOCK function
The EM91401 serial provides the LOCK function to inhibit toll dialing operation. Connecting a resistor on COL1
SDO Keypad Encoded table:
Digital key (b5,b4=0,0)
Function key (b5,b4=1,0)
keypad
output
b3,b2,b1,b0
Display
ready
Keypad
1
1
“*”/T
*/”T”
P
F
1
2
3
4
5
6
7
8
9
0
#
start bits
2
2
0
clear all display
3
3
bit5
1111
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
F
4
4
bit 0
bit4
5
5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
bit1
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
6
6
bit3
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
bit2
data bits
7
7
bit3
bit2
8
8
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
bit4
AND DUAL-TONE MELODY GENERATOR
9
9
bit1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
bit5
0
0
bit0
“*”/T
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
stop bits
clear all display
#
1
EM91401 SERIES
Display
P */”T”
P
1
2
3
4
5
6
7
8
9
0
P
10.1.1997
8

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