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| 型號： | P87C055 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Microcontrollers for TV and video MTV |
| 中文描述： | 電視和視頻微控制器MTV |
| 文件頁數(shù)： | 19/40頁 |
| 文件大?。?/td> | 243K |
| 代理商： | P87C055 |
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1996 Mar 22
19
Philips Semiconductors
Product specification
Microcontrollers for TV and video (MTV)
83C145; 83C845
83C055; 87C055
13.6
OSD Special Function Registers
The programming interface to Display RAM is provided by
three Special Function Registers as shown in Tables 15,
17 and 20.
Writing OSAT simply latches the attribute bits into a
register, while writing OSDT causes the data bus
information, plus the contents of the OSAT register, to be
written into display RAM.
Thus, for a given Display RAM location, OSAT should be
written before OSDT. If successive characters are to be
written into Display RAM with the same attributes, OSAT
need not be rewritten for each character, only prior to
writing OSDT for the first character with those particular
attributes.
The OSAT attribute bits associated with the BSpace,
SplitBSpace and New Line characters (see Table 19) are
interpreted differently from those that accompany other
data characters. With BSpace and SplitBSpace, B is
interpreted as described above, but the 3 colour bits
specify the background colour (Bcolor) for subsequent
characters. For BSpace, a change in B and Bcolor
becomes effective at the left edge of the character’s bit
map.
13.6.1
S
PECIAL
F
UNCTION
R
EGISTER
OSAD
Table 15
Special Function Register OSAD (On Screen ADdress; address 9AH)
Table 16
Description of OSAD bits
13.6.2
S
PECIAL
F
UNCTION
R
EGISTER
OSDT
Writing OSDT causes the data bus information, plus the contents of the OSAT register, to be written into display RAM.
Table 17
Special Function Register OSDT (On Screen DaTa; address 99H)
Table 18
Description of OSDT bits
7
6
5
4
3
2
1
0
OSAD6
OSAD5
OSAD4
OSAD3
OSAD2
OSAD1
OSAD0
BIT
SYMBOL
OSAD6 to OSAD0
DESCRIPTION
7
Reserved.
These 7-bits hold the Display RAM address into which data will be
loaded. OSAD is automatically incremented by one each time OSDT and
Display RAM are written to.
6 to 0
7
6
5
4
3
2
1
0
OSDT5
OSDT4
OSDT3
OSDT2
OSDT1
OSDT0
BIT
SYMBOL
OSDT5 to OSDT0
DESCRIPTION
7 to 6
5 to 0
Reserved.
Character data; see Table 19. In reality, there is a potential conflict
between the timing of a write to OSDT and an access to display RAM by
the OSD logic for data display. This is resolved by the use of a true
dual-ported RAM for display memory.
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