UPD16488AP NEC [NEC], UPD16488AP Datasheet - Page 51

• Manufacturer Part Number: UPD16488AP
• Description: 1/92 DUTY LCD CONTROLLER/DRIVER WITH FOUR-LEVEL GRAY SCALE, ON-CHIP RAM
• Manufacturer: NEC [NEC]

5.8.2 Monochrome (black/white) display
mode contents is configured as 128 bits x 128 bits (16 x 8 bits). When using these IC's in monochrome display mode, two
screens of data can be written to the display RAM and the two screens can be switched by setting the DSEL bit in the
control register 2 (R1). Screen 1 is displayed on the LCD panel when DSEL = L and screen 2 is displayed when DSEL = H.
control register 2 (R1) determines which of the two screens the data will be written to: when BWW = L, data is written to
screen 1 and when BWW = H, data is written to screen 2, as shown in Figure 5-25.
CPU) corresponds to the SEGx portions of the LCD display, as shown in Figure 5-26. Figure 5-27 shows the relationship
between the display data in monochrome display mode and the page/column addresses.
Data
The PD16488A provides both a four-level gray scale display mode and a monochrome display mode.
To switch to the monochrome display mode, set GRAY = H. The display RAM for one screen of monochrome display
When writing data, the display RAM uses the same X address (00H to 0FH) and Y address and the BWW bit value in the
When accessing a specified bit, specify both the X address and Y address. The display data in D
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
0 1 0 0 0 1 0 1 1 1 1 1 0 0 1 1
0 1 0 0 0 1 0 1 0 0 0 0 0 1 0 0
0 1 1 0 0 1 0 1 0 0 0 0 0 1 0 0
0 1 0 1 0 1 0 1 1 1 1 1 0 1 0 0
0 1 0 0 1 1 0 1 0 0 0 0 0 1 0 0
0 1 0 0 0 1 0 1 0 0 0 0 0 1 0 0
0 1 0 0 0 1 0 1 1 1 1 1 0 0 1 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
00H
Screen 1
DSEL = L (during display)
BWW = L (during write)
Figure 5-25. Display RAM Image in Monochrome (Black/White) Mode
Figure 5-26. Relationship Between Display Data and LCD Display
Display data
Data Sheet S15745EJ2V0DS
0FH
00H
Screen 2
DSEL = H (during display)
BWW = H (during write)
LCD display
0
to D
0FH
7
(sent from the
PD16488A
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