Marine VHF Audio and Signalling Processor
CMX885
This word holds the next 2 bytes (Byte 0 and 1) of DSC data to be transmitted. Outgoing data is
continuous, if new data is not provided before the current data has been transmitted the current data will
be re-transmitted, until new data is provided. Transmission of current data will be completed before
transmission of newly loaded data begins. See section 7.7.2.
In DSC Formatted mode, if the flag bit (b15 or b7) is set, then the accompanying character is ignored.
8.1.26 Tone Status – $CC read
15
14
13
12
11
10
9
x
8
7
6
x
5
x
4
x
3
x
2
x
1
x
0
x
Device Ident Code
x
DTMF Tone Detected
DT
x
x
After power-on or General Reset, this register will contain the Device Ident code related to this particular
device. The host µC may use this to confirm that the device is in its correct operational mode before
attempting to actively use the device.
In normal operation, this word holds the current status of the CMX885 DTMF detector. This word should
be read by the host after an interrupt caused by a DTMF event. In Tx mode this register will be cleared to
0.
b15
b10
reserved – ignore this bit.
set if b14-11 represent DTMF tone.
b14-11 Detected inband frequency; identifies the frequency by its position in Table 3 DTMF Tone Pairs.
A change in the state of bits 14 to 10 will cause the Status register $C6:b12, to be set to 1.
b9-0
reserved – ignore these bits.
© 2010 CML Microsystems Plc
47
D/885/3
CMLMICRO [ CML MICROCIRCUITS ]
