參數(shù)資料
型號： 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
文件頁數(shù)： 48/80頁
文件大?。?/td> 266K
代理商： P83C270AAR
1999 Jun 11
48
Philips Semiconductors
Product specification
Microcontrollers for NTSC TVs with On-Screen
Display (OSD) and Closed Caption (CC)
P8xCx70 family
18.6
Memory mapping
All registers and RAM in the display section are mapped into the upper 32-kbyte external RAM range of the 80C51 core.
When writing to the display section, memory units (CLUT and the Display RAM) have wider formats than 8-bits.
Two bytes are written for each word, the first byte (even addresses), addresses the lower 8-bits; the lower nibble of the
second byte (odd addresses), addresses the upper 4-bits.
18.6.1
A
CCESSING MEMORY
The memories can be accessed by the microprocessor as if it is external RAM.
Fig.19 Byte mapping.
handbook, halfpage
7
MGL149
0
character data
7
0
3
11
0
processor byte n
+
1
Fig.20 Memory and register mapping.
handbook, halfpage
registers
(16 bytes)
87FFH
87F0H
F
0
registers
F
0
CLUT RAM
22FH
000H
MGL152
display data
RAM
(1120 bytes)
871FH
8700H
845FH
8000H
801FH
8020H
microcontroller
address
internal RAM
address
CLUT
(32 bytes)
scroll map
display data
2 bytes/
character
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