參數(shù)資料
型號： P87C766CBP
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： Microcontrollers for PAL/SECAM TV with OSD and VST
中文描述： 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PDIP42
封裝： 0.600 INCH, PLASTIC, SDIP-42
文件頁數(shù)： 61/92頁
文件大?。?/td> 382K
代理商： P87C766CBP
1999 Mar 10
61
Philips Semiconductors
Product specification
Microcontrollers for PAL/SECAM TV
with OSD and VST
P8xCx66 family
17.6
Loading character data into display RAM
Three registers are used to address and load data into the
display RAM: OSAD, OSDT and OSAT. These registers
are described in Sections 17.6.1 to 17.6.3.
17.6.1
OSD A
DDRESS
R
EGISTER
(OSAD)
This register holds the address of the location in display
RAM, into which character data is to be written.
Table 73
OSD Address Register (address 9BH)
17.6.2
OSD D
ATA
R
EGISTER
(OSDT)
This register holds the character font data that will be
loaded into bits <11-5> of the location in RAM addressed
by the contents of OSAD.
Table 74
OSD Data Register (address 9AH)
17.6.3
OSD A
TTRIBUTE
R
EGISTER
(OSAT)
This register is loaded with character attribute data.
The data will be loaded into bits <4-0> of the location in
RAM addressed by the contents of OSAD. The actual
attribute is dependent upon whether the Character Font
Code, Carriage Return Code, Space Code 1 or Space
Code 2 has been selected.; this is explained in
Section 17.5.1. Bits 7 to 5 are not used and are reserved.
Table 75
OSD Attribute Register (address 99H)
7
6
5
4
3
2
1
0
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
7
6
5
4
3
2
1
0
C6
C5
C4
C3
C2
C1
C0
7
6
5
4
3
2
1
0
0
T4
T3
T2
T0
17.7
Writing character data into the display RAM
The procedure for writing character data into the display
RAM is as follows:
1.
Initialize the starting address of the display RAM by
writing data into OSAD.
2.
Write the character attributes to OSAT. If the attributes
of a series of displayed characters are the same, the
contents of this register need not be changed; only
OSDT need be updated.
3.
Write the character font code to be displayed to OSDT.
When the write to OSDT operation is finished an
automatic transfer occurs that loads the data stored in
OSAT and OSDT into the display RAM location
addressed by OSAD. The address held in OSAD is
then incremented by ‘1’.
4.
Post increment operation is executed in OSAD
(OSAD
←
OSAD + 1) making it point to the next RAM
location. On overflow OSAD is cleared. Figure 39
shows the post-increment operation.
Fig.39 OSAD post-increment operation.
handbook, halfpage
MGL282
01
02
03
04
89
90
91
189
190
191
numbers are in decimal
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