D6461 NEC Electronics Inc., D6461 Datasheet - Page 40

• Manufacturer Part Number: D6461
• Description: CMOS LSI CHIP FOR Camcorder On-screen Character Display 12 ROWS x 24 Columns
• Manufacturer: NEC Electronics Inc.

40
5. CHARACTER PATTERNS
characters, and symbols, which are stored in the character generator ROM. Each pattern in the character generator ROM
can be modified by specifying a mask code option. However, the display-off data at character address FEH ( PD6461)/
7EH ( PD6462) and end code for second-byte continuous input at FFH ( PD6461)/7FH ( PD6462) cannot be modified.
No character pattern can be stored at these addresses.
( PD6462), the character pattern is called blank data. Character address FEH ( PD6461)/7EH ( PD6462) contains display-
off data. Blank data and display-off data are represented in the same way (with no dots filled) in character patterns shown
on the following pages, but they are different as follows:
option. Blank data, however, can be specified at any address from 00H to FDH ( PD6461)/00H to 7DH ( PD6462) (address
FFH ( PD6461)/7FH ( PD6462) cannot be used because it contains the end code for second-byte continuous input).
following pages.
The PD6461, 6462 can display 256 ( PD6461)/128 ( PD6462) character patterns, including alphanumerics, Kanji
When none of the 12
You cannot specify display-off data for addresses other than FEH ( PD6461)/7EH ( PD6462) when using a mask code
The character patterns of the PD6461GS-101/102,
Blank data
Display-off data
Character data
Table 5-1 The Differences between Blank Data and Display-off Data
18 dots are filled for a character pattern at addresses 00H to FDH ( PD6461)/00H to 7DH
Displays image.
Displays image.
No background
Display of character area in each background mode
PD6462GS-001 (NEC’s standard model) are shown on the
Displays background.
Displays image only
(without background).
Minimum background
Displays background.
Displays image only
(without background).
Overall background
PD6461, 6462