SCL Serial Clock — This is the serial clock for the keyboard IIC bus. The IIC controller on the
A7 CPU assembly generates this clock to synchronize the transfer of data from the
A11 Keyboard Controller assembly.
SDA Serial Data — This is the keyboard IIC bus. When a key is pressed or the RPG is turned,
SINTFPn interrupts the A7 CPU assembly and this line transmits data to the A7 CPU assembly
in 8-bit frames.
SINTFPn Serial Interrupt from the Front Panel — A high-to-low transition on this line interrupts the
A7 CPU assembly. This line goes low when a key is pressed or when the RPG is turned.
Agilent 35670A Voltages and Signals
A11 Keyboard Controller
9-19
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