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M3099EX/EH OEM Manual 3-37
INTERFACE
SPECIFICATIONS
Control register A#21
Control register B#21
X'00' is set when the power is turned on or when a CLEAR
command is issued for initialization.
b7 b0
A #21
B #21
Contrast specification
X'00': Default (same as for X'80')
X'01': Lowest contrast
X'80': Normal
X'FF': Highest contrast