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11
KX-NT551RU/KX-NT551RU-B
4.2.5.
ASIC (IC205)
IC205 controls KEY, LED, EHS and Headset-detect.
An operating clock is provided by IC502 and a reset signal from the IC502 starts either reset or normal operating.(L(0V):RESET)
The IC205 and IC502 are connected by an I2C communication.
IC502 checks the presence of IC205 by getting the signal from IC205.
An operating clock is provided by IC502 and a reset signal from the IC502 starts either reset or normal operating.(L(0V):RESET)
The IC205 and IC502 are connected by an I2C communication.
IC502 checks the presence of IC205 by getting the signal from IC205.
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 .
Therefore, the LED control and the KEY control are alternately executed.
The timing chart is as shown in the following .
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