参数资料
型号: ST20Cx
厂商: 意法半导体
英文描述: Instruction Set Reference Manual
中文描述: 指令集参考手册
文件页数: 202/212页
文件大小: 647K
代理商: ST20CX
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页第118页第119页第120页第121页第122页第123页第124页第125页第126页第127页第128页第129页第130页第131页第132页第133页第134页第135页第136页第137页第138页第139页第140页第141页第142页第143页第144页第145页第146页第147页第148页第149页第150页第151页第152页第153页第154页第155页第156页第157页第158页第159页第160页第161页第162页第163页第164页第165页第166页第167页第168页第169页第170页第171页第172页第173页第174页第175页第176页第177页第178页第179页第180页第181页第182页第183页第184页第185页第186页第187页第188页第189页第190页第191页第192页第193页第194页第195页第196页第197页第198页第199页第200页第201页当前第202页第203页第204页第205页第206页第207页第208页第209页第210页第211页第212页
9/212
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
相关PDF资料
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
相关代理商/技术参数
参数描述
ST20GP1 制造商:未知厂家 制造商全称:未知厂家 功能描述:GPS PROCESSOR
ST20-GP1 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:GPS PROCESSOR
ST20GP1X33S 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:GPS PROCESSOR
ST20GP6 制造商:未知厂家 制造商全称:未知厂家 功能描述:GPS PROCESSOR
ST20-GP6 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:GPS PROCESSOR