hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 87

• Manufacturer Part Number: hd66789
• Description: 528-channel, One-chip Driver For Amorphous Tft Panels With 262,144-color Display Ram, Power Supply Circuit, And Gate Circuit
• Manufacturer: Renesas Electronics Corporation.

HD66789
Rev.0.12, May 09 2003, page 87 of 156
Internal Clock Operation to VSYNC Interface
Transition flow between VSYNC and internal clock operation modes
Note: When t he interface mode is switched, VSYNC should be
input before setting of DM1-0 and RM.
setting (DM1-0 = 0, RM = 0)
Index register set (R22h)
Internal clock mode setting
Internal clock operation
VSYNC interface mode
Wait more than 1 frame
Wait more than 1 frame
Wait more than 1 frame
VSYNC interface
Internal clock operation
(DM1-0 =00, RM = 0)
HWM = 1, AM = 0
Write data to RAM
VSYNC interface
Address Setting
operation
Display operation
in synchronization with
the internal clock
The values set in DM1-0 and RM
become valid after completion of
1-frame display.
Displa y operation
in synchronization with
VSYNC
VSYNC Interface to Internal Clock Operation
VSYNC interface operation
Note: When switching into the internal clock mode, the VSYNC signal
Internal clock mode setting
Internal clock operation
Wait more than 1 frame
(DM1-0 = 0, RM = 0)
must be kept continuously supplied for more than 1 frame
after it is switched into the internal clock mode.
Display operation
in synchronization with
VSYNC
The values set in DM1-0 and RM
become valid after completion of
1-frame display.
Display operation
in synchronization with
the internal clock
Preliminary