Data Communication Circuit - Panasonic KX-TES824LA Service Manual

11.6. DATA COMMUNICATION CIRCUIT

11.6.1. Composition
This circuit is composed of the ASIC and the data communication interface circuits for the ICM circuit.
11.6.2. Circuit Operation
1) Data Communication of ASIC
The APT I/f module is built into the CPU. It is for the APT communication of one block (8ch) and has the module of three blocks
(24ch) at maximum.
Selection signal of 3 bits to select 1ch out of 8chs is common to each block.
The APT I/f module switches the communication point every 4ms in the ports 1-8/9-16/17-24 of the extension as follows:
#101→#102→#103→#104.....→#108→#101.....,
#109→#110→#111→#112.....→#116→#109.....,
#117→#118→#119→#120.....→#124→#117.....,
In the case where the extension is not connected with the APT, it is recognized as an SLT connection and a dummy
communication is performed.
Interface block diagram of ASIC and ICM
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KX-TES824LA / KX-TEM824LA /