LM1237BDKD/NA/NOPB National Semiconductor, LM1237BDKD/NA/NOPB Datasheet - Page 21

• Manufacturer Part Number: LM1237BDKD/NA/NOPB
• Manufacturer: National Semiconductor

Specifications of LM1237BDKD/NA/NOPB

• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Package Type: MDIP
• Lead Free Status / RoHS Status: Compliant

LM1237 Address Map
Preamp Interface Registers
Register
Fonts - 2 Color
Fonts - 4 Color
Display Page
FRMCTRL1
FRMCTRL2
CHARFONTACC
VBLANKDUR
Address Range
Address Range
0x0000–0x2FFF
0x3000–0x3FFF
0x4000–0x7FFF
0x8000–0x81FF
Address
0x0000–
0x3000–
0x8000–
0x2FFE
0x3FFE
0x83FF
0x8400
0x8401
0x8402
0x8403
+1
+1
R/W
R/W
R/W
—
R
R
Default
0x10
0x80
0x00
0x10
TABLE 5. Display Page RAM Address Map
ROM Character Fonts, 190 two-color Character Fonts that are read-only. The format
of the address is as follows:
A15–A14: Always zeros.
A13–A6: Character value (0x00–0xBF are valid values)
A5–A1: Row of the character (0x00–0x11 are valid values)
A0: Low byte of line when a zero. High byte of line when a one.
The low byte will contain the first eight pixels of the line with data Bit 0 corresponding
to the left most bit in the Character Font line. The high byte will contain the last four
pixels and data. Bits 7–4 are “don’t cares”. Data Bit 3 of the high byte corresponds to
the right most pixel in the Character Font line.
ROM Character Fonts, 64 four-color Character Fonts that are read-only. The format of
the address is as follows:
A15–A14: Always zeros.
A13–A6: Character value (0xC0–0xFF are valid values)
A5–A1: Row of the character (0x00–0x11 are valid values)
A0: Low byte of line when a zero. High byte of line when a one.
The low byte will contain the first eight pixels of the line with data Bit 0 corresponding
to the left most bit in the Character Font line. The high byte will contain the last four
pixels and data Bits 7–4 are “don’t cares”. Data Bit 3 of the high byte corresponds to
the right most pixel in the Character Font line.
NOTE: The value of Bit 0 of the Character Font Access Control Register (Address
0x8402) is a zero, it indicates that the Bit 0 data value of the four-color pixels is being
accessed via these addresses. When the value of Bit 0 of the Access Control Register
is a one, it indicates that the Bit 1 data value of the four-color pixel is being accessed
via these addresses.
Reserved.
Display Page RAM Characters. A total of 512 display characters, skipped line,
end-of-row and end-of-window character codes may be supported via this range.
To support skipped lines and character attributes a number of special case rules are
used when writing to this range. (Refer to the Display Page RAM section of this
document for more details.)
TABLE 4. Character ROM Address Map
PIXELS_PER_LINE (2:0)
D7
TABLE 6. OSD Interface Registers
X
X
X
X
X
CHAR_CODE[7:4] or reserved
D6
X
X
X
X
21
D5
X
X
X
X
VBLANK_DURATION (6:0)
TD
D4
X
X
X
PIXEL (7:0)
PIXEL (7:0)
Description
Description
CDPR
D3
CHAR_CODE[3:0] or ATTR_CODE
X
BLINK_PERIOD (4:0)
D2E
D2
PIXEL (11:8)
PIXEL (11:8)
X
ATTR
D1E
D1
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FONT4
OSE
D0