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參數(shù)資料
| 型號(hào)： | ST20Cx |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Instruction Set Reference Manual |
| 中文描述： | 指令集參考手冊(cè) |
| 文件頁(yè)數(shù)： | 2/212頁(yè) |
| 文件大?。?/td> | 647K |
| 代理商： | ST20CX |
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word[
address]references a 32-bit word in memory
For all of these, the state of the machine referenced is that
before the instruction if the
function is used without a prime (e.g. word[]), and that
after the instruction if the
function is used with a prime (e.g. word
′[]).
For example, writing a value given by an expression,
expr, to the word in memory at
address
addr is represented by:
word
′[addr] ← expr
and reading a word from a memory location is achieved by:
Areg
′← word[addr]
Writing to memory in any of these ways will update the contents of memory, and these
updates will be consistently visible to the other representations of the memory, e.g.
writing a byte at address 0 will modify the least significant byte of the word at address
0.
Reading and writing in this way cannot be used to access on-chip peripherals.
Reading or writing to memory addresses between
PeripheralStart and PeripheralEnd
will have undefined effects.
Data alignment
Each of these data items have restrictions on their alignment in memory. Byte values
can be accessed at any byte address, i.e. they are byte aligned. 16-bit objects can
only be accessed at even byte addresses, i.e. the least significant bit of the address
must be 0. 32-bit and 64-bit objects must be word aligned, i.e. the 2 least significant
bits of the address must be zero.
Address calculation
An address identifies a par ticular byte in memory. Addresses are frequently calculated
from a base address and an offset. For different instructions the offset may be given in
units of bytes, words or double words depending on the data type being accessed. In
order to calculate the address of the data, the offset must be converted to a byte offset
before being added to the base address. This is done by multiplying the offset by the
number of bytes in the particular units being used. So, for example, a word offset is
converted to a byte offset by multiplying it by the number of bytes in a word (4 in the
case of the ST20).
As there are many accesses to memory at word offsets, a shorthand notation is used
to represent the calculation of a word address. The notation
register @ x is used to
represent an address which is offset by
x words (4x bytes) from register. For example,
in the specification of
load non-local there is:
Areg
′← word[Areg @ n]
Here, Areg is loaded with the contents of the word that is n words from the address
pointed to by Areg (i.e. Areg
+ 4n).
In all cases, if the given base address has the correct alignment then any offset used
will also give a correctly aligned address.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST223C04CCP0L | 745 A, 400 V, SCR, TO-200AB |
| ST223C04CCP0 | 745 A, 400 V, SCR, TO-200AB |
| ST223C04CCP1L | 745 A, 400 V, SCR, TO-200AB |
| ST223C04CCP1 | 745 A, 400 V, SCR, TO-200AB |
| ST223C04CCP2L | 745 A, 400 V, SCR, TO-200AB |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST20GP1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:GPS PROCESSOR |
| ST20-GP1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:GPS PROCESSOR |
| ST20GP1X33S | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:GPS PROCESSOR |
| ST20GP6 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:GPS PROCESSOR |
| ST20-GP6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:GPS PROCESSOR |
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