MT8889CC View Datasheet(PDF) - Mitel Networks
Part Name
Description
MFG CO.
'MT8889CC' PDF : 18 Pages View PDF
MT8889C/MT8889C-1
MMD6150 (or
equivalent)
TEST POINT
5.0 VDC
2.4 kΩ
130 pF
24 kΩ
MMD7000 (or
equivalent)
TEST POINT
5.0 VDC
3 kΩ
100 pF
Test load for D0-D3 pins
Test load for IRQ/CP pin
Figure 14 - Test Circuits
INITIALIZATION PROCEDURE
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
Motorola
RS0 R/W
1
1
Intel
WR RD
10
Data
b3 b2 b1 b0
XXX X
2) Write to Control Register
3) Write to Control Register
1
0
01
1
0
01
0
0
0
0
0
0
0
0
4) Write to Control Register
5) Write to Control Register
6) Read Status Register
1
0
01
1
0
01
1
1
10
1
0
0
0
0
0
0
0
XXX X
TYPICAL CONTROL SEQUENCE FOR BURST MODE APPLICATIONS
Transmit DTMF tones of 50 ms burst/50 ms pause and Receive DTMF Tones.
Sequence:
1) Write to Control Register A
RS0
1
(tone out, DTMF, IRQ, Select Control Register B)
2) Write to Control Register B
1
(burst mode)
3) Write to Transmit Data Register
0
(send a digit 7)
4) Wait for an Interrupt or Poll Status Register
5) Read the Status Register
1
R/W
0
0
0
1
WR RD
01
01
01
10
b3 b2 b1 b0
1
1
0
1
0
0
0
0
0
1
1
1
XXX X
-if bit 1 is set, the Tx is ready for the next tone, in which case ...
Write to Transmit Register
0
0
01
(send a digit 5)
0
1
0
1
-if bit 2 is set, a DTMF tone has been received, in which case ....
Read the Receive Data Register
0
1
10
XXX X
-if both bits are set ...
Read the Receive Data Register
Write to Transmit Data Register
0
1
10
0
0
01
XXX X
0
1
0
1
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)
4-118
Figure 15 - Application Notes
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