LC75886PW Datasheet, PDF (33/36 Pages) ON Semiconductor – 1/4 and 1/3-Duty LCD Display Driver

LC75886PW
Data Communication Flowchart of 4 Line Type or 3 Line Type CCB Format
1. Flowchart of the initial setting when power is turned on.
Power on
(Applications must observe that the power
supply VDD rise time is at least 1ms.)
Power supply stability
(Applications must wait till the level of
the power supply is stable)
Serial data input
(Display and control data transfer)
System reset clear
(Display on, Key scanning is enabled,
General-purpose output port state
setting are enabled)
Note: The flowchart of initial setting when power is
turned on is same regardless of the 4 line type
or 3 line type CCB format.
Take explanation about "system reset" into account.
2. Flowchart of the serial data input
Data communication start
command transfer
*18
Serial data input
(Display and control data transfer)
The controller
NO
wants to detect the key
data read request signal
(a low level on DO).
Note: *18. In the case of the 4 line type CCB format,
the transfers of data communication start
command and data communication stop
YES
command are unnecessary, and, in the case
of the 3 line type CCB format, these transfers
Data communication stop
command transfer
*18
are necessary.
3. Flowchart of the serial data output
The controller
NO
acknowledges the key data read
request (When the CE is low,
the DO is low)
Note: *19. In the case of the 4 line type CCB format,
the transfer of data communication start
command is unnecessary, and, in the case
YES
of the 3 line type CCB format, the transfer
Data communication start
command transfer
*19
is necessary.
*20. Because the serial data output has the role
of the data communication stop command,
Serial data output
(Key data and sleep
*20
acknowledge data read)
it is not necessary to transfer the data
communication stop command some other
time.
No.A1391-33/36