EM91203 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

6

* This specification are subject to be changed without notice.

10.1.1997

• To select Pulse or Tone mode.

• Off-hook (or turn on HF function), push d1, d2, .. , dn, RD/P, k1, k2, .. , kn . These numbers will be dialed

out as following sequence:

d1, d2, .. , dn, Tp, k1, k2, .. , kn.

Pulse to Tone (*/T or P-T) key operation

The Pulse to Tone (*/T or P-T) key is designed to support toll dialing (long distance call) or PABX system

operation. The "*/T (or P-T)" key can be stored in memory and it will occupy one digital position.

• To select Pulse mode.

• Off-hook (or turn on HF function), push d1, d2, .. , dn, */T, (or P-T) k1, k2, .. , kn. These numbers will be dialed

out as following sequence:

d1, d2, .. , dn, Tpt, k1, k2, .. , kn.

(pulse mode)

(tone mode)

Flash (F) key operation

The Flash (F) key is designed to break telephone line temporarily. After F key is depressed, this dialer will send

a flash signal to break line 600 ms, 300 ms, 100 ms or 80 ms as ROW3 and ROW4 selection.

Handfree (HF) function

The handfree function is designed to support on-hook dialing and loudspeaker application which can be turn “on”

or “off” with falling edge signal from HFI pin. During handfree function is executed, the HFO pin is switched

to “high”. Otherwise the HFO pin stays “low” level.

Truth table

Operating state

Input/Output pin level

HKS

PO

XMUTE

PM

HFO

(0) On-hook, idle state

H

F

F

L

L

(1) Off-hook line

L

F

F

L

L

(2) Off-hook, HF line

L

F

F

L

H

(3) On-hook, HF line

H

F

F

L

H

Note : F=floating (high impedance); H=logic “High”; L=logic “Low” level.

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.

0

1

bit 0

bit1

bit2

bit3

bit4

bit5

ready

start bits

data bits

0

1

stop bits