Elektronik FAQ V7.1 - HOME

Elektronik – FAQ
Eine Gemeinschaftsproduktion der Gruppe ELEKTRONIK im MausNet
Der Befehlssatz des HD44780 LCD-
Controllers
R |
/ |R| Data Execution
W|S|76543210 time
-+-+---------------------- Command from CPU to LCD
0|0|00000001 1.64ms Clear display
0|0|0000001x 40us-1.64ms Home cursor
0|0|000001is 40us Entry mode set
0|0|00001dcb 40us On/off control
0|0|0001srxx 40us Cursor/shift
0|0|001dnfxx 40us Function set
0|0|01aaaaaa 40us Character RAM Address Set
0|0|1aaaaaaa 40us Display RAM Address Set
--------------------------- Data from CPU to LCD
0|1|dddddddd 40us Write Data to DD RAM
0|1|dddddddd 120us Write Data to CG RAM
--------------------------- Read Operations from LCD to CPU
1|0|baaaaaaa 1 cycle Read Busy Flag
1|1|zzzzzzzz 40us Read Data from DD RAM
1|1|zzzzzzzz 120us Read Data from CG RAM
x=don't care
i:1/0 = increment/decrement DD RAM address by 1 after each DD
RAM write or read.
s:1/0 = display scroll on/off
d:1/0 = display on/off a: = Address
c:1/0 = cursor on/off d: = Data to CG or DD RAM
b:1/0 = blink character at cursor b:1/0 = Display Busy/Ready
position on/off a: = Current (DD/CG) RAM
address counter
s:1/0 = scroll display/move cursor. z: = Data from CG or DD RAM
r:1/0 = right/left.
d:1/0 = 8/4-bit interface.
n:1/0 = (1/16)/(1/8 or 1/11) duty (multiplex ratio).
= 2/1-line Display
f:1/0 = 5x11/5x8 dots.
Weiterführende Informationen: ELEKTOR 10/1995 S.24: "LCD für PC"
Kapitel Der Befehlssatz des HD44780 LCD-Controllers, Seite 1
317