keilc51对ansi的拓展学习（Keilc51s extended learning of ANSI）.docVIP

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keilc51对ansi的拓展学习（Keilc51s extended learning of ANSI）.doc

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keilc51对ansi的拓展学习（Keilc51s extended learning of ANSI）

keilc51对ansi的拓展学习（Keilc51s extended learning of ANSI） Understanding and application of C51 extension to the ANSIC standard is one of the key learning C51. Because most extensions are directly aimed at the 8051 series of CPU hardware. The following 8 categories: 8051 types of storage and storage area Storage mode Memory type declaration Variable type declarations A variable and bit addressing Special function register (SFR) C51 pointer Function attribute Specify the following (8031 is the default CPU). The first section of the Keil C51 keyword expansion C51 V4.0 version has the following extended keywords (19 in total): _at_ IData sfr16 alien interrupt small Bdata large _task_ Code bit pdata Using reentrant XDATA compact sbit data SFR The second section memory area (Memory Areas): 1. Pragram Area: The Code program memory can have up to 64kBytes 2. Internal Data Memory: The internal data memory available the following keyword description: Data: direct addressing, internal RAM low 128 byte 00H ~ 7FH IData: indirect addressing area, including the internal RAM 00H ~ FFH Bdata: bit addressable area, 20H ~ 2FH 3. External Data Memory Depending on the use of external RAM can be identified by the following keywords: XDATA: can be specified up to 64KB external direct addressing, the address range 0000H to 0FFFFH Pdata: access to page 1 (25bBytes) of the external RAM, mainly used in compact mode (Compact Model). 4. Speciac Function Register Memory 8051 provide SFR addressing 128Bytes area, this region bit addressable byte addressing, or word addressing, used to control the counter, timer, serial port, I/O and other components, can be illustrated by the following keywords: SFR: SFR P0=0x80 for addressing such as; PO port address for 80H, constant = H ~ FFH. Sfr16: word addressing, such as sfr16 T2=0xcc; Timer2 T2L=0xcc T2H=0xCD specifies the port address Sbit: bit addressing, such as sbit EA=0xAF; specified in article 0xAF to EA, which is allowed to interrupt Can also have the