Read Panasonic KX-UT248RU / KX-UT248RU-B (serv.man3) Service Manual online
12
KX-UT248RU/KX-UT248RU-B
4.2.5.
ASIC (IC204)
IC204 controls KEY, LED, EHS and Headset-detect.
An operating clock is provided by IC503 and a reset signal from the IC503 starts either reset or normal operating.(L(0V):RESET)
The IC204 and IC503 are connected by an I2C communication.
IC503 checks the presence of IC204 by getting the signal from IC204.
An operating clock is provided by IC503 and a reset signal from the IC503 starts either reset or normal operating.(L(0V):RESET)
The IC204 and IC503 are connected by an I2C communication.
IC503 checks the presence of IC204 by getting the signal from IC204.
LED and KEY Timing chart
The LED control and the KEY control use the same strobe(STB) signal.
Therefore, the LED control and the KEY control are alternately executed.
The timing chart is as shown in the following .
The LED control and the KEY control use the same strobe(STB) signal.
Therefore, the LED control and the KEY control are alternately executed.
The timing chart is as shown in the following .
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