參數(shù)資料
型號(hào): ST6399
廠商: 意法半導(dǎo)體
英文描述: MOSFET; Transistor Polarity:P Channel; Drain Source Voltage, Vds:-30V; Continuous Drain Current, Id:-4.1A; On-Resistance, Rds(on):0.08ohm; Rds(on) Test Voltage, Vgs:-10V; Package/Case:8-1206; Leaded Process Compatible:No
中文描述: 8位微控制器HCMOS電視頻率合成帶OSD
文件頁數(shù): 18/68頁
文件大?。?/td> 560K
代理商: ST6399
MEMORY SPACES
(Continued)
Data ROM Addressing.
Allthe read-only data are
physicallyimplementedin theROM inwhich thePro-
gramSpaceis alsoimplemented.TheROMtherefore
containstheprogramtobeexecutedandalsothecon-
stantsandthelook-uptablesneededfortheprogram.
ThelocationsofDataSpaceinwhichthedifferentcon-
stants and look-up tables are addressed by the
ST639xCore can be considered as being a 64-byte
window throughwhich it is possibleto accessto the
read-onlydatastoredintheROM.This window is lo-
catedfromthe40haddressto the7Fhaddressinthe
Dataspaceandallowsthedirect readingofthebytes
from the 000h address to the 03Fh address in the
ROM.All the bytesoftheROMcanbe usedto store
eitherinstructionsorread-onlydata.Indeed,thewin-
dowcanbemovedbystepof64bytesalongtheROM
in writing the appropriatecodein theWrite-onlyData
ROMWindowregister(DRWR, locationC9h).Theef-
fectiveaddressof thebytetobe readasa datainthe
ROM is obtained by the concatenationof the 6 less
significantbits of the address in the Data Space(as
lesssignificant bits) and thecontentoftheDRWR (as
most significant bits). So when addressing location
40hofdataspace,and0 isloadedintheDRWR, the
physicaladdressedlocationinROM is00h.
Note.
The dataROM window cannot addresswin-
dows abovethe 16k byte range.
DWR
Data ROMWindow Register
(C9h, Write Only)
D7 D6 D5 D4 D3 D2 D1 D0
DWR0 = Data ROMWindow 0
DWR1 = Data ROMWindow 1
DWR2 = Data ROMWindow 2
DWR3 = Data ROMWindow 3
DWR4 = Data ROMWindow 4
DWR5 = Data ROMWindow 5
DWR6 = Data ROMWindow 6
DWR7 = Data ROMWindow 7
Figure 16. Data ROM Window Register
DATA ROM
WINDOW REGISTER
CONTENTS
(DWR)
DATA SPACE ADDRESS
40h-7Fh
IN INSTRUCTION
PROGRAM SPACE ADDRESS
READ
6
5
4
3
2
0
5
4
3
2
1
0
5
4
3
2
1
0
1
6
7
8
9
10
11
0
1
VR01573B
12
1
0
DATA SPACE ADDRESS
59h
0
0
0
0
0
1
0
0
1
1
1
Example:
DWR=28h
1
1
0
0
0
0
0
0
0
0
1
ROM
ADDRESS:A19h
1
1
13
0
1
7
0
0
Figure17. Data ROM Window Memory Addressing
DWR7-DWR0.
These are the Data Rom Window
bits that correspond to the upper bits of data ROM
program space.This register is undefined after re-
set.
Note.
Careis requiredwhenhandlingtheDRWR as
it is write only. For this reason, it is not allowed to
change the DRWR contents while executing inter-
ruptsdrivers, asthe drivercannot saveand than re-
store its previous content.If it is impossibleto avoid
thewriting ofthisregisterin interruptsdrivers, anim-
ageofthisregistermustbesavedinaRAMlocation,
and each time the program writes the DRWR it
writes also the image register. The image register
must be written first, so if an interrupt occurs be-
tweenthe two instructionsthe DRWR register is not
affected.
ST6391,92,93,95,97,99
14/64
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