AN-929| Application Note
Microcontroller Interface to the ADC12038 Families
Microcontroller Interface to the ADC12038 Families
National Semiconductor Application Note 929 Emmy Denton February 1994
Table of Contents
1.0 General Overview ................................................................................................................................... 2 1.1 THE SERIAL INTERFACE ................................................................................................................... 2 1.2 THE SERIAL OUTPUT WORD FORMAT ............................................................................................ 4 1.3 SELECTING OUTPUT WORD FORMAT AND MODE ........................................................................ 5 1.4 MULTIPLEXER ADDRESSING ............................................................................................................ 7 1.5 STATUS REGISTER DEFINITION ...................................................................................................... 8 1.6 PROGRAMMING PROCEDURE ......................................................................................................... 8 2.0 General Flow Chart for a Microcontroller Interface ................
.............................................................. 10 3.0 Examples of Microcontroller Hardware Implementations ..................................................................... 11 3.1 THE 68HC11 ...................................................................................................................................... 11 3.2 NATIONAL'S HPC AND COP ............................................................................................................ 11 3.3 THE 8051 ........................................................................................................................................... 11 4.0 68HC11 SPI Interface ........................................................................................................................... 11 4.1 68HC11 SPI PORT AND REGISTER INITIALIZATION FOR THE ADC12038 ................................. 11 4.1.1 DDRD ..................................................................................................................
......................... 12 4.1.2 SPCR ............................................................................................................................................ 12 4.2 68HC11 Program Listing .................................................................................................................... 14 5.0 References ............................................................................................................................................ 16
AN-929
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