hd66765 Renesas Electronics Corporation., hd66765 Datasheet - Page 51

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

2. Write mode 2: AM = 1, LG2–0 = 000
This mode is used when the data is vertically written at high speed. It can also be used to initialize
the GRAM, develop the font pattern in the vertical direction, or draw borders. The write-data mask
function (WM11–0) is also enabled in these operations. After writing, the address counter (AC)
automatically increments by 256, and automatically jumps to the upper-right edge (I/D = 1) or upper-
left edge (I/D = 0) following the I/D bit after it has reached the lower edge of the GRAM.
Operation Examples:
1) I/D = "1", AM = "1", LG2-0 = "000"
2) WM11—0 = "0FF"H
3) AC = "0000"H
Write-data mask:
Write data (1):
Write data (2):
Write data (3):
"0000"H
"0001"H
"0002"H
Note:
1 0 0 1 * * * * * * * *
1 1 0 0 * * * * * * * *
0 1 1 1 0 1 0 0 0 0 0 1
Figure 37 Writing Operation of Write Mode 2
1. The bits in the GRAM indicated by ’*’ are not changed.
2. After writin to address "AF00"H, the AC jumps to "0001"H.
DB11
DB11
0
1
1 1 0 0 0 0 1 1 0 0 0 0
0 1 1 1 0 1 0 0 0 0 0 1
0 0 0 1 1 1 1 1 1 1 1
0 0 1 1 0 0 1 0 1 0 0
51
GRAM
Write data (1)
Write data (2)
Write data (3)
DB0
DB0
HD66765