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Panasonic KX-TA1232/KX-TD816/KX-TD1232 Hardware Architecture
This article aims to document some of my findings while researching the inner workings of my D816 PABX. While several versions exist for all those models, the general operational principles are, more or less, the same.
Those units have a lot in common and the schematics I could find seem to confirm they're iterations of the same project, even though TA1232 has important differences, like not supporting digital proprietary phones.
CPU
The CPU is a classic 68k chip. My unit, particularly, uses a TMP68301AF-12 CPU. According to the datasheet, it's based in the 68HC000 core, produced by Toshiba. It's a 16-bit processor, with 24 addressing lines and 16-bit wide bus.
While the CPU might be different between versions (newer models do operate at 12 MHz, in contraposition to older models at 8 MHz), the pinout seems to be largely the same in all three versions.
| KX-TD1232CE/1232BX etc. | KX-TD816E (UK) | KX-TA1232 |
|---|---|---|
 |  |  |
