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C-code software routines for using the SPI interface on the MAX7456 on-screen display

Posted: 19 Aug 2009 ?? ?Print Version ?Bookmark and Share

Keywords:C code MAX7456? software routines? SPI interface?

The MAX7456 on-screen display (OSD) generator has an SPI-compatible control interface. This application note describes the operation of the SPI interface. The article also includes C-code that a microcontroller can use to control the part through a bit-banged SPI interface.

The MAX7456 single-channel, monochrome on-screen display (OSD) generator is preloaded with 256 characters and pictographs, and can be reprogrammed in-circuit using the SPI port. The SPI-compatible serial interface programs the operating modes, the display memory, and the character memory. Read capability permits both write verification and reading of the Status (STAT), Display Memory Data Out (DMDO ) and Character Memory Data Out (CMDO) registers.

View the PDF document for more information.

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