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參數資料
| 型號： | ST6265BB6 |
| 廠商： | 意法半導體 |
| 英文描述： | 8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, AUTO-RELOAD TIMER, EEPROM AND SPI |
| 中文描述： | 8位檢察官辦公室/存儲器與阿微控制器/ D轉換器，自動重加載定時器，EEPROM和的SPI |
| 文件頁數： | 10/74頁 |
| 文件大小： | 538K |
| 代理商： | ST6265BB6 |
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10/74
ST62T55B ST62T65B/E65B
MEMORY MAP
(Cont’d)
1.3.5 Data Window Register (DWR)
The Dataread-only memory window islocatedfrom
address 0040h to address 007Fh in Data space. It
allows direct reading of64 consecutive bytes locat-
ed anywhere in program memory, between ad-
dress 0000h and 0FFFh (top memory address de-
pends on the specific device). All the program
memory can therefore be used to store either in-
structions or read-only data. Indeed, the window
can be moved in steps of 64 bytes along the pro-
grammemory bywritingtheappropriate code inthe
Data Window Register (DWR).
The DWR can be addressed like any RAM location
in the Data Space, it is however a write-only regis-
ter and therefore cannot be accessed using single-
bit operations. This register is used to position the
64-byte read-only data window (from address 40h
to address 7Fh of the Data space) in program
memory in 64-byte steps. The effective address of
the byte to be read as data in program memory is
obtained by concatenating the 6 least significant
bits of the register address given in the instruction
(as least significant bits) and the content of the
DWR register (as most significant bits), as illustrat-
ed in5 below. For instance, when addressing loca-
tion 0040h of the Data Space, with 0 loaded in the
DWR register, the physical location addressed in
program memory is 00h. The DWR register is not
cleared on reset, therefore it must be written to pri-
or to the first access to the Data read-only memory
window area.
Data Window Register (DWR)
Address: 0C9h
—
Write Only
Bits 6, 7 = Not used.
Bit 5-0 =
DWR5-DWR0:
Data read-only memory
Window Register Bits. These are the Data read-
only memory Window bits that correspond to the
upper bits of the data read-only memory space.
Caution:
This register is undefined on reset. Nei-
ther read nor single bit instructions may be used to
address this register.
Note:
Care is required when handling the DWR
register as it is write only. For this reason, the
DWR contents should not be changed while exe-
cuting an interrupt service routine, as the service
routine cannot save and then restore the register’s
previous contents. If it is impossible to avoid writ-
ing to the DWR during the interrupt service routine,
an image of the register must be saved in a RAM
location, and each time the program writes to the
DWR, it must also write to the image register. The
image register must be written first so that, if an in-
terrupt occurs between the two instructions, the
DWR is not affected.
Figure 5.Data read-only memory Window Memory Addressing
7
0
-
-
DWR5 DWR4 DWR3 DWR2 DWR1 DWR0
DATA ROM
WINDOWREGISTER
CONTENTS
(DWR)
DATA SPACE ADDRESS
40h-7Fh
IN INSTRUCTION
PROGRAM SPACE ADDRESS
READ
7
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
VR01573C
12
1
0
DATA SPACE ADDRESS
59h
:
:
0
0
0
0
1
0
0
1
1
1
Example:
DWR=28h
1
1
0
0
0
0
0
0
0
1
ROM
ADDRESS:A19h
1
1
13
0
1
10
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| ST6265BB6/XXX | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, SAFE RESET, AUTO-RELOAD TIMER, EEPROM AND SPI |
| ST6265BM1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, SAFE RESET, AUTO-RELOAD TIMER, EEPROM AND SPI |
| ST6265BM1/XXX | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, SAFE RESET, AUTO-RELOAD TIMER, EEPROM AND SPI |
| ST6265BM3 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, SAFE RESET, AUTO-RELOAD TIMER, EEPROM AND SPI |
| ST6265BM3/XXX | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, SAFE RESET, AUTO-RELOAD TIMER, EEPROM AND SPI |
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