...    16   8   0   The function of the various components of the on-chip RAM space and the addressing modes by which they may be accessed are discussed ...

... optimizations such as global sub expression elimination, loop optimizations (loop invariant, strength reduction of induction variables and loop reversing ), constant folding and propagation, copy propagation, ...

... core The R8051XC2 is the world's fastest configurable, single-chip 8-bit microcontroller core that can implement a variety of designs utilizing the MCS 51 instruction set. A rich set of optional features ...

... transfer instructions, boolean variable manipulation instructions and program and machine control instructions. OpcodeBytesMnemonicOperands 00 1 NOP   01 2 AJMP addr11 ...

8-bit Core Still in Use The Intel 8051 (official designation for 8051 family is MCS-51) is a Harvard architecture, single chip microcontroller (µC) which was developed by Intel in 1980 for use ...

... XBP sets XBP to point to the top of pushed parameters pushes Self parameter which was passed in R3R2 pushes VMT parameter which was passed in R5R4 reserves space for local variables (increases ...

... point to the top of pushed parameters reserves space for local variables (increases XSP accordingly) On exit called procedure pops saved XBP and removes all pushed parameters from XDATA stack. XDATA ...

... Compiler Written in Turbo Pascal. Data storage All variables and typed constants are stored in little endian format. Boolean variables Boolean variables are stored as bits in bit-addressable ...

... to be declared. You don't have to preserve any register and don't assume anything about register content before assembler statement. Byte variables AR0 to AR7 are direct locations for registers R0 to R7 ...

... from any interrupt. Warning: make sure that all varables that might be changed in the interrupt procedure are marked with the Volatile directive. This will tell the compiler that their value can be modified ...

... variables for value storage), by reference (Turbo51 automatically creates static variables for pointer storage) or you can pass values in registers. Procedure's parameters can be accessed as local variables ...

Pascal Compiler for 8051 Microcontrollers Abs Function Abs (X: Integer): Integer; Function Abs (X: Real): Real; Abs returns the absolute value of a variable. The result of the function ...

Pascal Compiler for 8051 Microcontrollers Assign Procedure Assign (Var F: File; ReadFunction: Function; WriteProc: Procedure); Procedure Assign assigns read function and write procedure to ...

Pascal Compiler for 8051 Microcontrollers Turbo51 variables can have memory type directives DATA, IDATA, or XDATA which overrides default memory type for variables (IDATA memory with addresses starting ...

... or XDATA which overrides default memory type for variables and sets memory type to which this pointer will point to. Examples:  ...

... a simple example of calculator using files: Compiled code looks like this: With the Assign statement you assign ReadFromSerialPort and WriteToSerialPort procedures to the File variable SerialPort. ...

Pascal Compiler for 8051 Microcontrollers System unit implements Turbo51 runtime library and defines some special function registers (SFR), bits and interrupt addresses that are present in all microcontrollers ...

... the $M directive or in one of the used units with the $XDATA directive. DATA / IDATA Memory organization If compiler switch $I is set then IDATA variables immediately follow DATA varables. If there ...

...  B- Full boolean evaluation C+ Show source lines in assembler file DefaultFile Off Assume CurrentIO system file variable is assigned with the actual IO procedures I+ IDATA ...

...  Make modified units -MG Set default memory type for global variables (memory type = D, I or X) -ML Set default memory type for local variables (memory type = D, I or X) -MP Set ...