MT8889CC_CC-1 Mitel Semiconductor, MT8889CC_CC-1 Datasheet - Page 12

• Manufacturer Part Number: MT8889CC_CC-1
• Description: 6V 10mA integrated DTMF transceiver with adaptive micro interface. For paging systems, repeater systems/mobile radio, credit card systems, personal computers, interconnect dialers
• Manufacturer: Mitel Semiconductor

MT8889C/MT8889C-1
4-118
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 k
2.4 k
5.0 VDC
MMD7000 (or
equivalent)
INITIALIZATION PROCEDURE
Figure 15 - Application Notes
Figure 14 - Test Circuits
RS0
RS0
1
1
1
1
1
1
1
1
0
1
0
0
0
0
Motorola
R/W
R/W
TEST POINT
1
0
0
0
0
1
0
0
0
1
0
1
1
0
WR RD
WR RD
1
0
0
0
0
1
0
0
0
1
0
1
1
0
Intel
Test load for IRQ/CP pin
0
1
1
1
1
0
1
1
1
0
1
0
0
1
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
3 k
100 pF
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