參數(shù)資料
型號(hào)： P83C845BBP
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： Microcontrollers for TV and video MTV
中文描述： 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PDIP42
封裝： 0.600 INCH, PLASTIC, SOT-270-1, SDIP-42
文件頁(yè)數(shù)： 30/40頁(yè)
文件大?。?/td> 243K
代理商： P83C845BBP
1996 Mar 22
30
Philips Semiconductors
Product specification
Microcontrollers for TV and video (MTV)
83C145; 83C845
83C055; 87C055
15 PROGRAMMING THE OSD EPROM
15.1
Overview
The OSD EPROM space starts at location C000H and
ends at location CFFFH. However, due to the addressing
scheme of the OSD, not all locations within this space are
used.The start location of the next character can be
calculated by adding 40H to the start location of the
previous character. For example, character 1 starts at
C000H; then characters 2, 3, and 4 start at C040H,
C080H, and C0C0H, respectively.
15.2
Character description and programming
An example of an OSD character bit map, and the program
data to obtain that character is shown in Table 34.
Each character is 14 bits wide by 18 lines high.A character
is split about a vertical axis into two sections UPPER and
LOWER as illustrated in Table 34:
Each section contains 7 bits of the character, such that:
– the LOWER section contains bits 7 to 1, and
– the UPPER section contains bits 14 to 8.
The LOWER section of the character is programmed
when the LSB of the program address equals a logic 0,
and the UPPER section when the LSB equals a logic 1.
During Programming and Verification, each section is
programmed using bytes of program data. The MSB of the
program data is not used; however, the MSB location
physically exists, and so will Program and Verify.
15.3
OSD EPROM bit map
The mapping for the full OSD EPROM is shown in Table 35. To program the example character into the first character
location of the OSD EPROM would require the data at the address as shown in Table 34.
Table 34
Example of an OSD Character Bit Map (note 1)
Note
1.
X can be a logic 0 or logic 1, and will Program and Verify correctly.
LINE
CHARACTER BIT MAP
PROGRAM DATA
ADDRESS (HEX)
UPPER
(BIT 14 TO 8)
LOWER
(BIT 7 TO 1)
UPPER
LOWER
UPPER
LOWER
Line 1
Line 2
Line 3
Line 4
Line 5
Line 6
Line 7
Line 8
Line 9
Line 10
Line 11
Line 12
Line 13
Line 14
Line 15
Line 16
Line 17
Line 18
0000000
0000000
0011110
0011110
0011110
0011110
0011110
0011110
0011111
0011111
0011111
0011110
0011110
0011110
0011110
0011110
0000000
0000000
0000000
0000000
0001100
0001100
0001100
0001100
0001100
0001100
1111100
1111100
1111100
0001100
0001100
0001100
0001100
0001100
0000000
0000000
X0000000
X0000000
X0011110
X0011110
X0011110
X0011110
X0011110
X0011110
X0011111
X0011111
X0011111
X0011110
X0011110
X0011110
X0011110
X0011110
X0000000
X0000000
X0000000
X0000000
X0001100
X0001100
X0001100
X0001100
X0001100
X0001100
X1111100
X1111100
X1111100
X0001100
X0001100
X0001100
X0001100
X0001100
X0000000
X0000000
C001
C003
C005
C007
C009
C00B
C00D
C00F
C011
C013
C015
C017
C019
C01B
C01D
C01F
C021
C023
C000
C002
C004
C006
C008
C00A
C00C
C00E
C010
C012
C014
C016
C018
C01A
C01C
C01E
C020
C022
相關(guān)PDF資料
PDF描述
P83C055 Microcontrollers for TV and video MTV
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P87C055BBP Microcontrollers for TV and video MTV
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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P83C851FFA 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:CMOS single-chip 8-bit microcontroller with on-chip EEPROM
P83C851FFB 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:CMOS single-chip 8-bit microcontroller with on-chip EEPROM
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