BU91797MUF-M Datasheet, PDF (10/27 Pages) Rohm – Low Duty LCD Segment Driver for Automotive application

BU91797MUF-M MAX 144 segments (SEG36×COM4)
Detailed Command Description
D7 (MSB) is a command or data judgment bit.
Refer to Command and data transfer method.
C: 0: Next byte is RAM write data.
1: Next byte is command.
Set IC Operation (ICSET)
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
C
1
1
0
1
P2 P1 P0
P2: MSB data of DDRAM address. Refer to “ADSET” command.
Set software reset execution.
Setup
P1
No operation
0
Software Reset Execute
1
When “Software Reset” is executed, BU91797MUF-M is reset to initial condition.
(Refer to Reset initialize condition)
Don’t set Software Reset (P1) with P2, P0 at the same time.
Set oscillator mode
Setup
P0 Reset initialize condition
Internal clock
0
○
External clock
1
Internal clock mode: OSCIN must be connected to VSS level.
External clock mode: Input external clock from OSCIN terminal..
<Frame frequency Calculation at external clock mode>
DISCTL 80Hz setting: Frame frequency [Hz] = external clock [Hz] / 512
DISCTL 71Hz setting: Frame frequency [Hz] = external clock [Hz] / 576
DISCTL 64Hz setting: Frame frequency [Hz] = external clock [Hz] / 648
DISCTL 53Hz setting: Frame frequency [Hz] = external clock [Hz] / 768
Datasheet
Command
OSCIN_EN
(Internal _signal )
(
Internal oscillation
( Internal signal )
External clock
( OSCIN )
ICSET
Internal clock mode
External clock mode
Figure 13. OSC MODE Switch Timing
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21.Dec.2015 Rev.001