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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)： | 17/71頁 |
| 文件大小： | 584K |
| 代理商： | ST63T69B1 |
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DRBR
Data RAM
Bank Register
(E8H, Write Only)
D7 D6 D5 D4 D3 D2 D1 D0
DRBR0
DRBR1
DRBR2
DRBR3
DRBR4
DRBR5
DRBR6
DRBR7
Figure16. Data RAM Bank Register
MEMORY SPACES
(Continued)
Data RAM/EEPROM
In theST636964 bytesofdataRAM aredirectlyad-
dressable in the data space from 80H to BFH ad-
dresses.Theadditional192 bytesof RAM, the 384
bytes of EEPROM can be addressed using the
banks of64 byteslocated betweenaddresses00H
and 3FH. The selection of the bank isdone bypro-
gramming the Data RAM Bank Register (DRBR)
located at the E8H address of the Data Space. In
this way each bank of RAM, EEPROMcan select
64 bytesat a time. No more than one bank should
be set at a time.
DRBR7,DRBR1,DRBR0.
These bits select the
EEPROM pages.
DRBR4,DRBR3,DRBR2.
Eachofthesebits,when
set, will select one RAM page.
This registeris undefined afterreset.
Table 5 summarizes how to set the Data RAM
Bank Registerin orderto select the various banks
or pages.
Note :
Care is required when handling the DRBR as it is
write only. For this reason, it is not allowed to
change the DRBR contentswhile executing inter-
rupts drivers, as the driver cannot save and than
restore its previous content. If it is impossible to
avoid the writing of this register in interrupts driv-
ers, an image of this register must be saved in a
RAM location, and each time the program writes
the DRBRit writes alsothe image register.
The image registermust be written first, soif an in-
terrupt occurs between the two instructions the
DRBR is not affected.
EEPROMDescription
The data space of ST6369 family from 00H to 3FH
is paged as described in Table 5. 384 bytes of
EEPROMlocated in six pages of 64 bytes(pages
0,1,2,3,4and 5, see Table 5).
DRBR Value
Selection
Hex.
Binary
01H
0000 0001
EEPROM Page 0
02H
0000 0010
EEPROM Page 1
03H
0000 0011
EEPROM Page 2
81H
1000 0001
EEPROM Page 3
82H
1000 0010
EEPROM Page 4
83H
1000 0011
EEPROM Page 5
04H
0000 0100
RAM Page 2
08H
0000 1000
RAM Page 3
10H
0001 0000
RAM Page 4
Table 5. Data RAM Bank Register Set-up
ST6369
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