ML69240-C49
FUNCTIONAL DESCRIPTION OF INTERFACE SIGNALS
LCD
This interface can drive 8x1, 8x2, 16x1 or 16x2 (characters x lines) type LCD modules, e.g.
RS294-8774.
E
0
1
1
1
1
RS
X
0
0
1
1
R/W
X
0
1
0
1
Function
disabled
instruction register write
instruction register read
data register write
data register read
Read
RS
R/W
E
DBx
Note:
*) typical value at 14.75 MHz
1ms*
Write
1ms*
KEYSCAN
This interface can drive a 4x4 standard passive matrix numeric keypad, e.g. RS331-304.
KR4
KR3
KR2
KR1
KC1
KC2
KC3
KC4
Keypad
ML69240-C49
42µs* 30µs*
3.2µs*
KCn
Notes:
n = 1, 2, 3, 4
*) typical values at 14.75 MHz
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