ST92185B STMicroelectronics, ST92185B Datasheet - Page 114

• Manufacturer Part Number: ST92185B
• Description: 16k/24k/32k Rom Hcmos Mcu With On-screen-display
• Manufacturer: STMicroelectronics

ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont’d)
7.4.6.4 Building a Parallel Mode, 40 Char, Line
mode Display
Half-Page Location:
The pair of adjacent 0.5 Kbyte blocks of half page
content is stored in the TDSRAM location pointed
to by the PG3..PG0 bits. One block contains the
characters, the other block contains the attribute
bytes.
Figure 74. Parallel (40 Characters) Line Mode Mapping
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Row 12/Scrolling Buffer
0.5K TDSRAM
Row 11 Char.
Row 1 Char.
Free Space
See
Figure 21
Resolution 1K bytes
for Address Values
Row 12/Scrolling Buffer
0.5K TDSRAM
Row 11 Attr.
Free Space
Row 1 Attr.
Header & Status Rows Location:
The 0.5 Kbyte block containing the Header, Status
Row 0 and Status Row 1 is pointed to by the
HS3..HS0 bits.
The Header/Status attributes are stored in this
block at offset 80h.
The Row attribute (row count) is stored in this
block at offset 100h and contains 12 bytes for line
mode (see DCM1R register description).
Row Scrolling Buffer Location:
The scrolling buffer corresponds to the Row 12
when the scrolling feature is used (in this case 11
rows are scrolled).
See
Figure 22
Resolution 0.5K bytes
0.5K TDSRAM
Header Char.
Status Row 0
Status Row 1
Status Row 0
Status Row 1
Header Attr.
Free Space
Free Space
Free Space
Row Attr.
for Address Values
80h
100h