Digilent 410-142P - Manual (Page 3)

PmodCLP Reference Manual Digilent, Inc.
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A startup sequence with specific timings is required to ensure proper LCD operation.
This sequence is defined in detail in the Samsung KS0066U data sheet, and
reproduced here for convenience.
After power-on, at least 20ms must elapse before the function-set instruction code
can be written to set the bus width, number of lines, and character patterns (8-bit
interface, 2 lines, and 5x8 dots are appropriate). After the function-set instruction, at
least 37us must elapse before the display-control instruction can be written (to turn
the display on, turn the cursor on or off, and set the cursor to blink or no blink). After
another 37us, the display-clear instruction can be issued. After another 1.52ms, the
entry-mode instruction can set address increment (or address decrement) mode, and
display shift mode (on or off). After this sequence, data can be written into the
DDRAM to cause information to appear on the display.
Note that other compatible LCD controllers use similar start-up sequences which may
not use the same timings as the Samsung controller.
Table 2. LCD Bus Timings
Parameter Symbol Min Max Unit Test Pin
Enable cycle time tc 500 ns E
Enable High pulse width tw 220 ns E
Enable rise/fall time tr, tf 25 ns E
RS, R/W setup time tsu 40 ns RS, R/W
RS, R/W hold time th 10 ns RS, R/W
Read data output delay tD 60 120 ns DB0-DB7
Read data hold time tDH 20 ns DB0-DB7
Write data setup time tsu1 40 ns DB0-DB7
Write data hold time th1 10 ns DB0-DB7
LCD startup
sequence