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MT8880CE-1 Datasheet(PDF) 9 Page - Mitel Networks Corporation |
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MT8880CE-1 Datasheet(HTML) 9 Page - Mitel Networks Corporation |
9 / 18 page ISO2-CMOS MT8880C/MT8880C-1 4-41 Table 2. Internal Register Functions RS0 R/W FUNCTION 0 0 Write to Transmit Data Register 0 1 Read from Receive Data Register 1 0 Write to Control Register 1 1 Read from Status Register Table 3. CRA Bit Positions Table 4. CRB Bit Positions b3 b2 b1 b0 RSEL IRQ CP/DTMF TOUT b3 b2 b1 b0 C/R S/D TEST BURST Table 5. Control Register A Description BIT NAME FUNCTION DESCRIPTION b0 TOUT TONE OUTPUT A logic ‘1’ enables the tone output. This function can be implemented in either the burst mode or non-burst mode . b1 CP/DTMF MODE CONTROL In DTMF mode (logic ‘0’) the device is capable of generating and receiving Dual Tone Multi-Frequency signals. When the CP (Call Progress) mode is selected (logic ‘1’) a 6th order bandpass filter is enabled to allow call progress tones to be detected. Call progress tones which are within the specified bandwidth will be presented at the IRQ/CP pin in rectangular wave format if the IRQ bit has been enabled (b2=1). Also, when the CP mode and BURST mode have both been selected, the transmitter will issue DTMF signals with a burst and pause of 102 ms (typ) duration. This signal duration is twice that obtained from the DTMF transmitter if DTMF mode had been selected. Note that DTMF signals cannot be decoded when the CP mode of operation has been selected. b2 IRQ INTERRUPT ENABLE A logic ‘1’ enables the INTERRUPT mode. When this mode is active and the DTMF mode has been selected (b1=0) the IRQ/ CP pin will pull to a logic ‘0’ condition when either 1) a valid DTMF signal has been received and has been present for the guard time duration or 2) the transmitter is ready for more data (BURST mode only). b3 RSEL REGISTER SELECT A logic ‘1’ selects Control Register B on the next Write cycle to the Control Register address. Subsequent Write cycles to the Control Register are directed back to Control Register A. |
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