Renesas R61509V - Manual (Page 12)

R61509V Target Spec
Rev. 0.11 April 25, 2008, page 12 of 181
Table 4
IM2 IM1 IM0 System interface DB pins RAM write data
Instruction write
transfer
0 0 0
80-system 18-bit
interface
DB17-0 Single transfer (18 bits)
Single transfer
(16 bits)
0 0 1
80-system 9-bit
interface
DB17-9 2-transfer (1 st : 9 bits, 2 nd : 9 bits)
2-transfer
(1
st : 8 bits, 2 nd : 8
bits)
0 1 0
80-system 16-bit
interface DB17-10,
DB8-1
Single transfer (16 bits)
2-transfer (1
st : 2 bits, 2 nd : 16 bits)
2-transfer (1 st : 16 bits, 2 nd : 2 bits)
Single transfer
(16 bits)
0 1 1
80-system 8-bit
interface
DB17-10
2-transfer (1 st : 8 bits, 2 nd : 8 bits)
3-transfer (1 st : 6 bits, 2 nd : 6 bits, 3 rd : 6
bits)
2-transfer
(1
st : 8 bits, 2 nd : 8
bits)
1 0 *
Clock
synchronous
serial interface -
(SDI,
SDO) 2-transfer (1 st : 8 bits, 2 nd : 8 bits)
2-transfer
(1
st : 8 bits, 2 nd : 8
bits)
1 1 0 Setting disabled - - -
1 1 1 Setting disabled - - -
2. External Display Interface (RGB, VSYNC interfaces)
The R61509V supports RGB and VSYNC interfaces as the external interface to display moving picture.
When the RGB interface is selected, the display operation is synchronized with externally supplied
synchronous signals (VSYNCX, HSYNCX, and DOTCLK). In RGB interface operation, data (DB17-0) is
written in synchronization with these signals when the polarity of enable signal (ENABLE) allows write
operation in order to prevent flicker when updating display data.
In VSYNC interface operation, the display operation is synchronized with the internal clock except frame
synchronization, which synchronizes the display operation with the VSYNCX signal. The display data is
written to the internal GRAM via system interface. When writing data via VSYNC interface, there are
constraints in speed and method in writing data to the internal RAM. For details, see Section “VSYNC
Interface”.
The R61509V allows switching interface by instruction according to the display image (still and/or moving
picture). This allows data to be transferred only when the data is updated hence less power consumption
during moving picture display.
3. Address Counter (AC)
The address counter (AC) gives an address to the internal GRAM. When the index of a register is written
to the IR, the address information is sent from the IR to the AC. After data is written to GRAM, the
address in the AC is automatically updated plus or minus 1. The window address function enables writing
data only within the rectangular area specified in the GRAM.