Automatic A/D converter operation with selectable result format
AssigneeMotorola, Inc.
InventorsJules D. Campbell, Jr., Craig D. Shaw, William DeWitt Huston
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Abstract
An analog-to-digital conversion system and method provide selectable data formats for each converted digital result value. Each digital result is stored in a register or table word. Information from a host processor is used to select a desired data format. In one embodiment the address range used to read the digital result serves to select the appropriate data format option, which may be, for example, left-justified or right-justified data, and signed or unsigned data. In another embodiment, one or more command words from the processor are used to select the desired data format.
Claims5
An analog-to-digital conversion system comprising:
- (a) an address bus;
- (b) an N-bit data bus;
- (c) an analog input terminal;
- (d) a sample and hold circuit having an input coupled to the analog input terminal and having an output;
- (e) an analog-to-digital converter circuit having an input coupled to the output of the sample and hold circuit and having an M-bit digital output, where M is less than N;
- (f) an interface circuit coupled to receive an address from the address bus and coupled to provide data to the data bus, the interface circuit also having an input coupled to the M-bit digital output of the analog-to-digital converter, the interface circuit further comprises:
- a data format circuit coupled to receive at least a portion of the address, the data format circuit couples an M-bit digital signal received from the analog-to-digital converter to either a first portion of the N-bit data bus or a second portion of the N-bit data bus, depending on a value of the portion of the address received by the data format circuit.
Dependencies are inferred from the claim text.