NEC PD17062 - Manual (Page 264)

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PD17062
20.7 SPECIFYING THE DISPLAY START POSITION
IDC display start positions (upper left of the screen) can be specified by setting data in the IDC start position
setting register. Up to 16 horizontal and vertical positions can be specified. In other words, the display position
of the entire screen can be shifted. The IDC start position setting register consists of a 4-bit vertical start
position setting register and a 4-bit horizontal start position setting register. The IDC start position setting
register is mapped at peripheral address 01H. It can be read- and write-accessed using the GET and PUT
instructions.
Note that the IDC start position setting register should not be written to when the IDCEN flag is 1.
Fig. 20-12 IDC Start Position Setting Register Configuration
b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
Horizontal start position Vertical start position