Agilent Technologies 35670-90066 manual A11 Keyboard Controller Block Diagram

Agilent 35670A	Circuit Descriptions
	A11 Keyboard Controller

	A11 Keyboard Controller
	The A11 Keyboard Controller assembly together with the A13 Primary and
	A14 Secondary Keypad assemblies make up the front panel keyboard. This assembly
	provides the interface between the A7 CPU assembly and the keypads.
Beeper	Generates a tone when instructed by the A7 CPU assembly. The beeper can be turned off by
	pressing [ System Utility ] [ BEEPER ON OFF ].
IIC Controller	Decodes data from the IIC bus providing the A13 Primary Keypad assembly with control lines
	that turn overload and source LEDs on and off.

Keyboard Microprocessor

Interrupts the A7 CPU assembly when a key is pressed or the RPG is turned. The CPU assembly then addresses the Keyboard Microprocessor and reads an 8-bit frame of data from the IIC bus to determine which key was pressed (for information about the IIC bus, see the description of the IIC Controller in the ‘’A7 CPU’’ earlier in this chapter).

Interrupt Detection Informs the A7 CPU assembly every time a key is pressed or the RPG is turned.

A11 Keyboard Controller Block Diagram

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