Panasonic KX-TDA0187 Manual page 24

7.5. EC BUS INTERFACE
7.5.1. Dual Port RAM (DPRAM) Communication
This card transmits and receives data between CPU (IC1) and MPR (EC bus) in a dual port RAM
communication basically.
Fig.5.7 shows the diagrammic illustration.
Fig.5.7 DPRAM Communication diagrammic illustration
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