Read Panasonic KX-TCD951GB / KX-TCD955GC Service Manual online
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KX-TCD951GB/KX-TCD955GC
1.3 FLASH PROM (SEE Fig. 26)
The 2 Mbit Flash PROM IC2 contains the operational firmware for the BBIC’s general purpose microprocessor. It is
interfaced to the BBIC using address lines AD0 to AD17, data lines DAB0 to DAB7, and the chip select (IC1 pin 84),
read (IC1 pin 86), and write (IC1 pin 93) control lines. On some handset models, the Flash ROM will also be contained
within the BBIC.
1.4 EEPROM (SEE Fig. 26)
The electrically erasable PROM IC3 is used to store all the temporary operating parameters for the handset
(see EEPROM LAYOUT page 69). It used a two-line serial data interface with the BBIC(TP82), with bi-directional data
on IC3 pin 5, and a 45 kHz clock on pin 6 (TP83).
1.5 LCD DISPLAY, AND DISPLAY DRIVER (SEE Fig. 27)
The LCD display also receives data via a serial interface. Serial data is sent to LCD display on pin 3 (TP70).
The RS signal (pin 1, TP67) is used by the BBIC to send either commands or data.
Fig. 27
Circuit Diagram
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