MT8888CPR1 Zarlink Semiconductor, Inc., MT8888CPR1 Datasheet - Page 16

• Manufacturer Part Number: MT8888CPR1
• Description: Integrated DTMF Transceiver with Intel Micro Interface
• Manufacturer: Zarlink Semiconductor, Inc.

A software reset must be included at the beginning of all programs to initialize the control registers after power up.The
initialization procedure should be implemented 100ms after power up.
Description:
1) Read Status Register
2) Write to Control Register
3) Write to Control Register
4) Write to Control Register
5) Write to Control Register
6) Read Status Register
Transmit DTMF tones of 50 ms burst/50 ms pause and Receive DTMF Tones.
Sequence:
1) Write to Control Register A
2) Write to Control Register B
3) Write to Transmit Data Register
4) Wait for an interrupt or poll Status Register
5) Read the Status Register
NOTE: IN THE TX BURST MODE, STATUS REGISTER BIT 1 WILL NOT BE SET UNTIL 100 ms (±2 ms) AFTER THE
DATA IS WRITTEN TO THE TX DATA REGISTER. IN EXTENDED BURST MODE THIS TIME WILL BE DOUBLED TO
200 ms (± 4 ms).
(tone out, DTMF, IRQ, Select Control Register B)
(burst mode)
(send a digit 7)
-if bit 1 is set, the Tx is ready for the next tone, in which case...
Write to Transmit Register
(send a digit 5)
-if bit 2 is set, a DTMF tone has been received, in which case....
Read the Receive Data Register
-if both bits are set...
Read the Receive Data Register
Write to Transmit Data Register
TEST POINT
130 pF
Test load for D0-D3 pins
TYPICAL CONTROL SEQUENCE FOR BURST MODE APPLICATIONS
MMD6150 (or
equivalent)
24 kΩ
5.0 VDC
2.4 kΩ
INITIALIZATION PROCEDURE
Figure 17 - Application Notes
MMD7000 (or
equivalent)
Figure 16 - Test Circuits
Zarlink Semiconductor Inc.
MT8888C
RS0
RS0
1
1
1
1
1
1
1
1
0
1
0
0
0
0
16
Control
WR
WR
1
0
0
0
0
1
0
0
0
1
0
1
1
0
TEST POINT
RD
RD
0
1
1
1
1
0
1
1
1
0
1
0
0
1
Test load for IRQ/CP pin
b3
b3
X
0
0
1
0
X
1
0
0
X
0
X
X
0
Data
b2
b2
X
0
0
0
0
X
1
0
1
X
1
X
X
1
5.0 VDC
100 pF
3 kΩ
Data Sheet
b1
b1
X
0
0
0
0
X
0
0
1
X
0
X
X
0
b0
b0
X
0
0
0
0
X
1
0
1
X
1
X
X
1