No. 6235-11/14

LC75844M

The INH pin and Display Control

Since the IC internal data (the display data and the control data) is undefined when power is first applied, applications

should set the INH pin low at the same time as power is applied to turn off the display (This sets the S1/P1 to S4/P4, S5

should then set the INH pin high after the data transfer has completed. This procedure prevents meaningless displays at

power on. (See Figure 3.)

Notes on the Power On/Off Sequences

Applications should observe the following sequence when turning the LC75844M power on and off.

However, if the logic and LCD driver block use a shared power supply, then the power supplies can be turned on and off

at the same time.

Figure 3

Notes on Controller Transfer of Display Data

Since the LC75844M accept display data (D1 to D88) divided into two separate transfer operations, we recommend that

applications transfer all of the display data within a period of less than 30 ms to prevent observable degradation of

display quality.

Internal data

Internal data (D45 to D88)

Undefined

Undefined

Defined

Undefined

Undefined

Note: t1

≥ 0

t2 > 0

t3

≥ 0 (t2 > t3)

tc ... 10 µs min

Display and control data transfer

D1 to D44

P0 to P2

DR, SC, BU

Defined