I want to use STM32 to drive a LCM with a KS0108 controller. Sadly, it has a 6800 interface. Fortunately, ST gives a document to guide me: TFT LCD interfacing with the high-density STM32F10xxx FSMC . In p. 12 it gives two methods:
But the http://www.techtoys.com.hk/Displays/JHD12864J/ks0108.pdf, states when write to LCD, the data is latched at the falling edge of "E":
Then, assuming we use the method 1 above, the pseudo-code should like:
lcd_addr = lcd_data;
gpio_E = LOW;
After the first clause, the /CS should goes to high, what's the state of the data bus, will it hold the data last output??? Or it will go to high impedance after /CS high? How can we make sure the LCM to latch the correct data?
For method 2, the situation should be similar.
Anyone ever tried ST's method?