EV8380 Datasheet, PDF (19/29 Pages) CML Microcircuits – Family Radio Processor

Evaluation Kit for CMX838 Family Radio Processor
19
EV8380 User Manual
The argument data has the following format in the SUBAUDIO TASK DATA ($95) register:
Bit 7
1=enable
0=disable
Bit 6
Don’t
care
Bits 5-0
Tone detector index number (1-51)
Additionally using index 63 can enable or disable all detectors while issuing just
one task. Enabling index 62 enables detection of all TIA-603 Tones. There is no
single command to disable just the TIA-603 Tone Detectors – instead use index 63
to disable all detectors.
NOTE: To determine the value to load in the SUBAUDIO PROCESSOR GENERAL CONTROL ($93) register,
the power control and IRQ control bits should be logically “OR-ed” with the desired task field.
For example, to configure the CMX838 to detect a 67Hz tone:
1. Write $81 to SUBAUDIO TASK DATA ($95) register.
2. Write $64 to SUBAUDIO PROCESSOR GENERAL CONTROL ($93) register.
5.2.5 How to Quickly Enable/Disable Multiple Detectors
Task 13 places the tone signaling processor in a mode that allows multiple detectors to be quickly configured.
Just as for task 12, neither the tone encoders nor the tone decoders operate in this mode. The argument
data for this task is defined as for task 4 (enable/disable tone detector).
When task 13 is executed, the tone signaling processor reverts to “Fast Initialization Mode” when any other
task is issued. To return to normal operation, task 0 (normal operation) must be issued to the tone signaling
processor.
NOTE: When enabling or disabling tone detectors with task 13, the argument data in the SUBAUDIO TASK
DATA ($95) register has the following format:
Bit 7
Bit 6
Bits 5-0
Tone detector index number (1-51)
1=enable
0=disable
Don’t
care
Additionally using index 63 can enable or disable all detectors while issuing just
one task. Enabling index 62 enables detection of all TIA-603 Tones. There is no
single command to disable just the TIA-603 Tone Detectors – instead use index 63
to disable all detectors.
NOTE: To determine the value to load in the SUBAUDIO PROCESSOR GENERAL CONTROL ($93) register,
the power control and IRQ control bits should be logically “OR-ed” with the desired task field.
The following example shows how to enable tone detectors 1, 7, 10, 12, 18, and 20 only. (NOTE: Multiple
calls to Task 4 can also be used to enable or disable multiple detectors but would, however, require more
C-BUS transactions and a waiting period of 250µs after each task 4 call. The use of multiple calls to task 4
would allow the tone decoders to continue to run, however.)
To disable all tone detectors and enter “quickly enable multiple detectors mode”:
1. Write $3F to SUBAUDIO TASK DATA ($95) register.
2. Write $4D to SUBAUDIO PROCESSOR GENERAL CONTROL ($93) register.
3. Wait 250µs to ensure the CMX838 performs Task 13
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