µPD16435, 16435A
(11) Extension X Address Register (Register Address = 1001B)
Performs extension display, display screen X (segment) direction address setting. X addresses include the scroll RAM
area. This register must be executed before the extension Y address register.
MSB
LSB
b4 b3 b2 b1 b0
× : Don’t Care
After powering on: Undefined
Character X address (00H to 15H)
(12) Extension Y Address Register (Register Address = 1010B)
Performs extension display, display screen Y (common) direction address setting. This register must be executed after
the X address.
MSB
LSB
b2 b1 b0
× : Don’t Care
Character Y address (00H to 07H)
After powering on: Undefined
(13) Scroll Register (Register Address = 1011B)
Performs scroll setting.
MSB
LSB
b7 b6 b5 b4 b3 b2 b1 b0
× : Don’t Care
Scroll direction setting
00: Scroll reset Note 1
01: Right scroll
10: Left scroll
11: Scrolling stopped Note 2
Scrolling by specification of any line is possible by setting
a character Y address after this command. Scrolling can only
be performed for one character-unit line.
Scroll speed setting (00H to 3FH)
This value specifies the number of frames for a one-bit move.
If 00H is set, scrolling is stopped.
Notes 1. When scroll reset is executed, the screen leftmost character X address returns to 00H, and scrolling is stopped.
2. After scrolling has been stopped, character Y address setting is necessary when scrolling is restarted. It is not
possible to set a different address from the character Y address before scrolling was stopped.
After powering on
0 0 0 0 0 000
15