Telephone Answering Data Transfer - Panasonic KX-MB2061CXB Service Manual

KX-MB2061CXB/KX-MB2061CX2/KX-MB2062CXB

6.23. Telephone Answering Data Transfer

6.23.1. UART Interface
SoC controls lines and voices while it communicates with BBIC (Base band IC).
Mainly BBIC controls them and SoC transmits and receives commands through the UART (Universal Asynchronous Receiver
Transmitter) interface.
Communication rate of UART is 115.2kbps.
6.23.2. SPI Interface
When voice data including TAM are transferred via PC or E-mail, data need to be transmitted and received by BBIC and SoC using
SPI (Serial peripheral Interface) system.
This 3 wire system of synchronous transfer uses signals SPICLK, SPIDO, and SPIDI.
Transfer clock (SPICLK) is 5.18 MHz and is supplied from BBIC to SoC.
The signal used differs depending on the direction of data transfer.
SPIDO is used on transfer from SoC to BBIC and SPIDI is used on transfer from BBIC to SoC.
The other signals, BMINFT1, BMINFT2, NCBUSY1, and NCBUSY2 are used to adjust data transfers as a whole.
Please refer to the next chart for details on the timing chart.
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