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PmodCLP Reference Manual
Enable cycle time
Enable High pulse width
Enable rise/fall time
RS, R/W setup time
RS, R/W hold time
Read data output delay
Read data hold time
Write data setup time
Write data hold time
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.
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Table 2. LCD Bus Timings
Parameter
Symbol
tc
tw
tr, tf
tsu
th
tD
tDH
tsu1
th1
Min
Max
Unit
500
ns
220
ns
25
ns
40
ns
10
ns
60
120
ns
20
ns
40
ns
10
ns
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www.digilentinc.com
Test Pin
E
E
E
RS, R/W
RS, R/W
DB0-DB7
DB0-DB7
DB0-DB7
DB0-DB7
LCD startup
sequence
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