DATA51 EQU 208H 8251A DATA PORTCTRL51 EQU 209H 8251A COMMAND PORTTIMER2 EQU 202H 8253 COUNT 2TIMCTL EQU 203H 8253 CTRL PORTCLK00 EQU 8192 8251A CLK 4.77MBPS00 EQU 1200 BPS=1200FACTOR EQU 16 8251A BPS FACTOR=16

arm7入门开发源代码 IRQStackq EQU 0 SVCSTACK EQU 32 ABORTSRACK EQU 32 UNDEFSTACK EQU 64 MODEASTACK EQU 32 NOINT SRAM_BASE EQU 0xD0000000 Defined External SRAM SRAM_SIZE EQU 0x1FFF SRAM_TOP EQU SRAM_BASE+SRAM_SIZE RAM_BASE EQU 0