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參數(shù)資料
| 型號： | UPSD3213BV-40U6T |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Flash Programmable System Devices with 8032 Microcontroller Core and 64Kbit SRAM |
| 中文描述： | 閃存可編程系統(tǒng)設(shè)備與8032微控制器核心和64Kbit SRAM的 |
| 文件頁數(shù)： | 24/176頁 |
| 文件大?。?/td> | 1081K |
| 代理商： | UPSD3213BV-40U6T |
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μ
PSD323X
24/176
Data Transfers
Internal RAM.
Table 6 shows the menu of in-
structions that are available for moving data
around withinthe internal memory spaces, andthe
addressing modes that can be used with each
one. The MOV <dest>, <src> instruction allows
data to be transferred between any two internal
RAM or SFR locations without going through the
Accumulator. Remember, the Upper 128 bytes of
data RAM can be accessed only by indirect ad-
dressing, and SFR space only by direct address-
ing.
Note:
In
μ
PSD323X Devices, the stack resides in
on-chip RAM, and grows upwards. The PUSH in-
struction first increments the Stack Pointer (SP),
then copies the byte into the stack. PUSH and
POP useonly direct addressing to identify thebyte
being saved or restored, but the stack itself is ac-
cessed by indirect addressing using the SP regis-
ter. This means the stack can go into the Upper
128 bytesof RAM, if theyareimplemented, butnot
into SFR space.
The Data Transfer instructions include a 16-bit
MOV thatcan be used to initialize the Data Pointer
(DPTR) for look-up tables in Program Memory.
The XCH A, <byte> instruction causes the Accu-
mulator and ad-dressed byte to exchange data.
The XCHD A, @Ri instruction is similar, but only
the low nibbles are involved in the exchange. To
see how XCH and XCHD can be used to facilitate
data manipulations, consider first the problem of
shifting and 8-digit BCD number two digits to the
right. Table 8 shows how this can be done using
XCH instructions. To aidin understanding how the
code works, the contents of the registers that are
holding the BCD number and the content of the
Accumulator are shown alongside eachinstruction
to indicate their status after the instruction has
been executed.
After the routine hasbeen executed, the Accumu-
lator contains the two digits that were shifted out
on the right. Doing the routine with direct MOVs
uses 14 code bytes. The same operation with
XCHs uses only 9 bytes and executes almost
twice as fast. To right-shift by an odd number of
digits, a one-digit must be executed. Table 9
shows a sample of code that will right-shift a BCD
number one digit, using the XCHD instruction.
Again, the contents of the registers holding the
number and of the accumulator are shown along-
side each instruction.
Table 6. Data Transfer Instructions that Access Internal Data Memory Space
Mnemonic
Operation
Addressing Modes
Dir.
Ind.
Reg.
Imm
MOV A,<src>
A = <src>
X
X
X
X
MOV <dest>,A
<dest> = A
X
X
X
MOV <dest>,<src>
<dest> = <src>
X
X
X
X
MOV DPTR,#data16
DPTR = 16-bit immediate constant
X
PUSH <src>
INC SP; MOV “@SP”,<src>
X
POP <dest>
MOV <dest>,”@SP”; DEC SP
X
XCH A,<byte>
Exchange contents of A and <byte>
X
X
X
XCHD A,@Ri
Exchange low nibbles of A and @Ri
X
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相關(guān)代理商/技術(shù)參數(shù) |
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| UPSD3214A-24T1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
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| UPSD3214A-24T6T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 Microcontroller Core and 64Kbit SRAM |
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