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R61509V Target Spec
Rev. 0.11 April 25, 2008, page 115 of 181
3. The front porch period continues from the end of one frame period to the next VSYNCX input.
4. The instructions to switch from internal clock operation (DM1-0 = 00) to VSYNC interface operation
modes and vice versa are enabled from the next frame period.
5. The partial display and vertical scroll functions are not available in VSYNC interface operation.
6. In VSYNC interface operation, set AM = 0 to transfer display data correctly.
Internal Clock Operation to VSYNC Interface
Operation via VSYNC interface
VSYNC Interface to Internal Clock Operation
Internal clock operation
AM = 0
RAM address set
Set DM1-0 = 01 and RM = 0
for VSYNC interface
Write data to RAM
via VSYNC interface
Wait one frame period
or more
Set index register to R202h
Display operation in
synchronization with
internal clocks
VSYNC interface operation
Display operation in
synchronization with
VSYNCX
Display operation in
synchronization with VSYNCX
Internal clock operation
Set internal clock
operation mode*
(DM1-0 = 00 and RM = 0)
Display operation in
synchronization with
internal clocks
Note: Continue VSYNC interface signals at least for
one frame period after setting DM1-0, RM bits
to internal clock operation.
Note: Input the VSYNC interface signals before setting the DM1-0 and RM bits
to the VSYNC interface operation.
*Instruction setting for
the RGB interface operation
is enebled from the next frame period.
*Instruction setting to the
internal clock operation
is enebled from the next
frame period.
Wait one frame period
or more
Internal clock synchronous
operation mode setting
(DM[1:0]=00, RM=0)
Wait one frame period
or more
Internal clock operation
Figure 37 Sequences to Switch between VSYNC and Internal Clock Operation Modes