UPD161622 NEC, UPD161622 Datasheet - Page 25

• Manufacturer Part Number: UPD161622
• Description: 396 OUTPUT TFT-LCD SOURCE DRIVER
• Manufacturer: NEC

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5.2.4 Arbitrary address area access (window access mode (WAS))
MAX. X/Y address registers (R9 and R11) can be accessed.
domain set up by MIN. X/Y address registers and MAX. X/Y address registers. The address scanning setting by
INC, XDIR, and YDIR of data access control register (R5) is also valid in window access mode, in the same manner
as when data is normally written to the display RAM. In addition, data can be written from any address by specifying
the X address register (R6) and Y address register (R7).
the window access area has been set or changed by the MIN. X/Y address register or MAX. X/Y address register.
Cautions 1. When using the window access mode, the relationship between the start point and end point
A setup of data access control (R5): WAS = 1 chooses window access mode. And PD161622 accesses only the
With the PD161622, any area of the display RAM selected by the MIN. ·X/Y address registers (R8 and R10) and
Note that the display RAM must be accessed after setting the X address register (R6) and Y address register (R7) if
2. If invalid address data is set as the MIN./MAX. address, operation is not guaranteed.
3. Do not specify any value other than the address value 4n n (n = 1 to 33) for the X address in the
4. Access the display RAM after setting the X address register (R6) and Y address register (R7) if
shown in the table below must be established.
high-speed RAM access mode. The operation is not guaranteed if invalid address data is set.
the window access area has been set or changed by the MIN. X/Y address register or MAX. X/Y
address register.
Figure 5 9. Example of Incrementing Address When INC = 0, XDIR = 0, and YDIR = 0
X address
Y address
MAX. Y address
MIN. Y address
Item
.
.
Start point
00H
00H
00H
MIN. X address
MIN. Y address
MIN. X address
.
Data Sheet S15649EJ2V0DS
X address (R4) MAX. X address
Y address (R5) MAX. Y address
Address Relation Ship
.
.
.
MAX. X address
.
83H
AFH
End point
83H
00H
AFH
PD161622
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