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Cx51 User's Guide
Cx51 Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming 8051 Derivatives
Analog Devices MicroConverter B2 Series Atmel 89x8252 and Variants Dallas 320, 420, 520, and 530 Dallas 390, 400, 5240, and Variants Arithmetic Accelerator Infineon C517, C509, 80C537, and Variants Data Pointers High-speed Arithmetic Library Routines NXP and Atmel Dual DPTR NXP 80C51MX Architecture NXP 8xC750, 8xC751, and 8xC752 Error Messages Library Reference AppendixNXP and Atmel Dual DPTR
NXP Semiconductors and Atmel Wireless and Microcontrollers provide several compatible 8051 variants with dual data pointers. Using multiple data pointers can improve the speed of library functions like memcpy, memmove, memcmp, strcpy, and strcmp.
The MODP2 directive instructs the Cx51 Compiler to generate code that uses both data pointers in your program.
The Cx51 Compiler uses at least one data pointer in an interrupt function. If an interrupt function is compiled using the MODP2 directive, both data pointers are saved on the stack - this happens even if the interrupt function uses only one data pointer.
To conserve stack space, you may compile interrupt functions with the NOMODP2 directive to prevent the Cx51 Compiler from using the second data pointer.
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