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參數(shù)資料
| 型號(hào)： | P83C270AAR |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Microcontrollers for NTSC TVs with On-Screen Display OSD and Closed Caption CC |
| 中文描述： | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PDIP52 |
| 文件頁(yè)數(shù)： | 56/80頁(yè) |
| 文件大?。?/td> | 266K |
| 代理商： | P83C270AAR |
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1999 Jun 11
56
Philips Semiconductors
Product specification
Microcontrollers for NTSC TVs with On-Screen
Display (OSD) and Closed Caption (CC)
P8xCx70 family
18.9.9
S
TATUS
R
EGISTER
(SR)
A status register is provided that holds information that the processor can use to regulate the way data is written into the
display unit. The register is split into a read only and write only register. Both use the same address.
Table 91
Status Register (address 87F8H); read only
Table 92
Description of SR bits
7
6
5
4
3
2
1
0
BUSY
FIELD
SCRL
SCR3
SCR2
SCR1
SCR0
BIT
SYMBOL
DESCRIPTION
7
BUSY
Character display active or vertical sync.
If BUSY = 0, this indicates that the
processor can access the display unit without causing effects on the screen. The lead
time is 4 ms, this is implemented to allow the microcontroller to finish the current access
to the display memory. Two modes are provided to switch between the text horizontal
blank area or vertical blank area.
Random information.
1st or 2nd Field of vertical frame.
Scroll busy.
If SCRL = 1, this bit indicates that the scroll function is in progress. When
this bit is set, the automatic scroll function is started. It is automatically cleared on
completion. If forced to a logic 0, the scroll function will be terminated as if all lines were
scrolled. Subsequent logic 0 writes will cause the scroll row to increment by one.
First scroll row select.
The value specified by these 4 bits selects the actual row that is
the first one to be displayed in the scroll area. This value is modified by the automatic
scroll function.
6
5
4
FIELD
SCRL
3
2
1
0
SCR3
SCR2
SCR1
SCR0
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