hd66765 Renesas Electronics Corporation., hd66765 Datasheet - Page 19

• Manufacturer Part Number: hd66765
• Description: 396-channel Segment Driver With Internal Ram For 4096-color Displays - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

During no display, when AP1–0 = 00, the current consumption can be reduced by ending the operational
amplifier and step-up circuit operation.
VC2-0: Sets an adjustment factor for the Vci voltage (VC2-0).
SLP: When SLP = 1, the HD66765 enters the sleep mode, where the internal display operations are
halted except for the R-C oscillator, thus reducing current consumption. Only the following instructions
can be executed during the sleep mode.
During the sleep mode, the other GRAM data and instructions cannot be updated although they are
retained.
Note: BS2-0, BT3-0, DC2-0, AP1-0, VC2-0 and SLP bits are for setting the common driver. Control
STB: When STB = 1, the HD66765 enters the standby mode, where display operation completely stops,
halting all the internal operations including the internal R-C oscillator. Further, no external clock pulses
are supplied. For details, see the Standby Mode section.
Only the following instructions can be executed during the standby mode.
During the standby mode, the GRAM data and instructions may be lost. To prevent this, they must be set
again after the standby mode is canceled. Serial transfer to the common driver is not possible when it is in
standby mode. Transfer the data again after it has been released from standby mode.
Contrast Control (R04h)
CT6–0: These bits control the LCD drive voltage to adjust 128-step contrast. For details, see the Contrast
Adjuster section.
VR3–0: These bits adjust the output voltage in the LCD drive reference generator.
Note: CT6-0 and VR3-0 bits are for setting the common driver. Control according to the bits’ values is
R/W
W
Power control (BS2–0, BT3–0, DC2–0, AP1–0, SLP, and STB bits)
Common interface control (TE, IDX)
a. Standby mode cancel (STB = 0)
b. Start oscillation
RS
according to the bits’ values is executed by the common driver. For details, see the data sheet for
the common driver.
executed by the common driver. For details, see the data sheet for the common driver.
1
DB15
0
DB14
0
DB13
0
DB12
Figure 7 Contrast Control Instruction
0
VR3
DB11
VR2
DB10
VR1
DB9
19
VR0
DB8
DB7
0
CT6
DB6
CT5
DB5
CT4
DB4
CT3
DB3
CT2
DB2
HD66765
CT1
DB1
CT0
DB0