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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 202/212頁 |
| 文件大?。?/td> | 647K |
| 代理商： | ST20CX |
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Subscripts are used to indicate particular bits in a word; e.g. Aregi for bit i of Areg; and
Areg0..7 for the least significant byte of Areg. Note that bit 0 is the least significant bit in
a word, and bit 31 is the most significant bit.
Generally, if the description does not mention the state of a register or memory
location after the instruction, then the value will not be changed by the instruction.
One exception to this general rule is Iptr, which is assigned the address of the next
instruction in the code
before every instruction execution starts. The Iptr is included in
the description only when it is
directly affected by the instruction (e.g. in the jump
instruction). In these cases the address of the next instruction is indicated by the
comment “
next instruction”.
Scheduling operations
Some registers, such as the timer and scheduling list pointers and some special
workspace locations, can be changed at any time by scheduling operations. Changes
to these are included in the description only when they are
directly caused by the
instruction, and not just as an effect of any scheduling operation which might take
place.
1.7.3
Undefined v alues
Many instructions leave the contents of a register or memory location in an undefined
state. This means that the value of the location may be changed by the instruction, but
the new value cannot be easily defined, or is not a meaningful result of the instruction.
For example, when the integer stack is popped, Creg becomes undefined, i.e. it does
not contain any meaningful data. An undefined value is represented by the name
undefined. The values of registers which become undefined as a result of executing
an instruction are implementation dependent and are not guaranteed to be the same
on different members of the ST20 family of processors.
1.7.4
Data types
The instruction set includes operations on four sizes of data: 8, 16, 32 and 64-bit
objects. 8-bit and 16-bit data can represent signed or unsigned integers; 32-bit data
can represent addresses, signed or unsigned integers, or single length floating point
numbers; and 64-bit data can represent signed or unsigned integers, or double length
floating point v alues. Normally it is clear from the context (e.g. from the operators
used) whether a particular object represents a signed, unsigned or floating point
number. A subscripted label is added (e.g. Aregunsigned) to clarify where necessary.
1.7.5
Representing memory
The memory is represented by arrays of each data type. These are indexed by a value
representing a byte address. Access to the four data types is represented in the
instruction descriptions in the following way:
byte[
address]references a byte in memory at the given address
sixteen[
address]references a 16-bit object in memory
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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