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[AVR] HOW TO interface WITH 9-bit spi in atmega8 avr MCU?

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shirko20

shirko20

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HI every one,i want to use Atmega8 MCU to inetrface Nokia 1202 lcd ,but problem here is that SPI of Atmega8 is 8-bit data transfer while this LCD uses 9-bit transfer data through SPI now is there any way to connect to this lcd wit Atmega8?
 

You get the answer by reading the STE2007 controller datasheet thoroughly.

Incomplete data bytes are discarded by the controller. Means if you are using a hardware SPI interface, which can send multiples of 8 bit only, you have to send e.g. 2 bytes (16 bits) to transfer 9 bit of data, but 7 bits are discarded.

Alternatively, you can send the d/c bit by bit banging and send data/command bytes through the hardware interface, you save the bit shift required otherwise. But the method involves enabling and disabling of the SPI interface.
 

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