NEC PD17062 - Manual (Page 250)

250
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PD17062
20.4.3 Carriage Return Data
The term carriage return data refers to the data pointing to the address of the VRAM data that specifies
the first character in a row on the screen.
The carriage return data specifies the end of a display row.
When carriage return data appears two times consecutively, it specifies the end of a screen.
There are two types of carriage return data; one type is a carriage return to BANK1, and the other is a carriage
return to BANK2. The data in the ID field determines whether the data field indicates a carriage return to BANK1
or BANK2. If the ID field contains 01B, it indicates a carriage return to BANK1, and if the ID field contains 11B,
it indicates a carriage return to BANK2.
The carriage return data consists of 6 bits, the upper 3 bits of which point to the row address of VRAM and
the lower 3 bits of which point to the upper 3 bits of the VRAM column address. The lowest bit of the VRAM
column address is fixed at 0. If the carriage return data is 010011B, therefore, the VRAM row address is 010B
(2H), and the VRAM column address is 0110B (6H); namely, they mean the return data to 26H.
Fig. 20-3 Carriage Return Data Configuration
b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0
ID field Data field
VRAM row address Upper 3 bits of the
VRAM column address