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參數(shù)資料
| 型號： | ST63T69B1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 8-BIT HCMOS MCU FOR DIGITAL CONTROLLED MULTI FREQUENCYMONITOR |
| 中文描述： | 8位HCMOS單片機的數(shù)控多FREQUENCYMONITOR |
| 文件頁數(shù)： | 14/71頁 |
| 文件大?。?/td> | 584K |
| 代理商： | ST63T69B1 |
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D7-D2.
Thesebitsarenotusedbut haveto be writ-
ten to “0”.
PRPR1-PRPR0.
These are the program ROM
banking bitsand thevalue loaded selects the cor-
responding page to be addressed in the lower part
of 4Kprogramaddress space asspecifiedin Table
3. Thisregisteris undefined onreset.
Table 3. Program ROM Page RegisterCoding
MEMORY SPACES
(Continued)
Figure11. Program ROM Page Register
Note.
Only the lower part of address space has
been bankswitchedbecause interrupt vectorsand
common subroutines should be available all the
time. The reason of this structureis dueto the fact
that it is not possible to jump from a dynamicpage
to another,unlessjumping back to the staticpage,
changingcontents of PRPR,and, then,jumping to
a different dynamicpage.
Care is required when handlingthe PRPR as it is
write only. For this reason, it is not allowed to
change the PRPR contents while executing inter-
rupts drivers, as the driver cannot save and than
restore its previous content. Anyway, this opera-
tion may be necessaryif the sum of common rou-
tines and interrupt drivers will take more than 2K
bytes; inthiscase could benecessaryto dividethe
interrupt driver in a (minor) part in the static page
(start and end), and in the second (major) part in
one dynamic page. If it is impossible to avoid the
writing of this register in interrupts drivers, an im-
age of this register must be saved in a RAM loca-
tion, and eachtime the programwrites the PRPR it
writes also the image register. The image register
must be written first, so if an interrupt occurs be-
tween the two instructions the PRPR is not af-
fected.
PRPR
Program ROMPage Register
(CAH, Write Only)
D7 D6 D5 D4 D3 D2 D1 D0
PRPR0
PRPR1
UNUSED
UNUSED
UNUSED
PRPR1
PRPR0
PC11
Memory
Page
X
X
1
Static Page (Page 1)
0
0
0
Page 0
0
1
0
Page 1
(Static Page)
1
0
0
Page 2
1
1
0
Page 3
ROM Page
Device Address
Description
PAGE 0
0000H-007FH
0080H-07FFH
Reserved
User ROM
PAGE 1
“STATIC”
0800H-0F9FH
0FA0H-0FEFH
0FF0H-0FF7H
0FF8H-0FFBH
0FFCH-0FFDH
0FFEH-0FFFH
User ROM
Reserved
Interrupt Vectors
Reserved
NMI Vector
Reset Vector
PAGE 2
0000H-000FH
0010H-07FFH
Reserved
User ROM
PAGE 3
0000H-000FH
0010H-07FFH
Reserved
User ROM
Table 4. ST6369 Program ROM Map
ST6369
10/67
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