CMX138 CML Microcircuits, CMX138 Datasheet - Page 50

• Manufacturer Part Number: CMX138
• Description: Audio Scrambler and Sub-Audio Signalling Processor
• Manufacturer: CML Microcircuits

Audio Scrambler and Sub-Audio Signalling Processor
9.1.20 Interrupt Mask - $CE write
To minimise the processing load on the host µC, it is advisable to only enable the interrupts that are
relevant for any given operational mode.
9.1.21 Reserved - $CF write
This C-BUS address is allocated for production testing and must not be accessed in normal operation.
3
© 2008 CML Microsystems Plc
AuxADC IRQ’s should be ignored / masked during mode changes: idle <-> Rx <-> Tx <-> idle.
IRQ
15
Bit
15
14
13
12
11
10
8
7
6
5
4
3
2
1
0
14
0
Rx in
Value
13
1
0
0
1
0
0
1
0
1
0
1
0
0
0
0
0
0
0
0
1
0
12
0
Function
Enable selected interrupts
Disable all interrupts (IRQN pin not activated)
reserved
Enable interrupt when a change to a In-band tone is detected
Disabled
reserved
Enable interrupt when a change to CTCSS tone is detected
Disabled
Enable interrupt on a change in the detect status of the DCS decoder
Disabled
Enable interrupt when the AuxADC status changes
Disabled
reserved
reserved
reserved
reserved
reserved
reserved
reserved
Enable interrupt when Prog Flag bit of the Status register changes from '0' to
'1' (see Programming register $C8)
Disabled
ctcss
11
dcs
10
9
0
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ADC
Aux
8
7
0
6
0
5
0
3
4
0
3
0
2
0
D/138_FI1.0/5
1
0
CMX138
PRG
0