![]() ![]() If active-low CS goes high in the middle of a transmission, the sequence is aborted (i.e., data is not written to the registers). When active-low CS transitions high, data is latched into the input register. Data is clocked in at SDIN on the rising edge of SCLK. To write to a register, bring active-low CS low to enable the serial interface. ![]() Figure 1 illustrates writing data and Figure 2 illustrates reading data from the device. The MAX7456 supports interface clocks (SCLK) up to 10MHz. For detailed information on the MAX7456 registers and memory organization, refer to the product data sheet and to application note 4117, " Generating Custom Characters and Graphics by Using the MAX7456's Memory and EV Kit File Formats." Read capability permits both write verification and reading of the Status (STAT), Display Memory Data Out (DMDO), and Character Memory Data Out (CMDO) registers. The SPI-compatible serial interface programs the operating modes, the display memory, and the character memory. 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. ![]()
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