sfr是说明地址的意思，P4是P4端口的意思。0x是16进制的意思，C0是16进制的数，转换成2进制是11000000。这句话的意思是P4端口的地址是11000000。在单片机中，有时需要说明P4的地址是多少，以便于程序的识别和运行。类似于sfr函数的还有sbit函数，只不过sbit是定义具体的某一位，例如例子中11000000的8位中...
SFRP4基因片段大小为1056bp EcoRI和HindIII双酶切重组质粒后凝胶电泳图 WesternBlot检测pcDNA TM 3.1-SFRP4质粒稳定 转染HCT116细胞后SFRP4的表达 0道为pcDNA3.1空载体,1和2道为pcDNA3.1-SFRP4 –pcDNA TM 3.1-SFRP4质粒的构建及稳定 转染株的鉴定
sdcc, which is quite popular open-source, free embedded compiler, uses special extensions for intel 8051 (aka mcs51) define special function registers and other similar things (like code, ram space, etc) e.g. __sfr __at (0xC0) P4 ; __sbit __at (0xC0) P4_0 ; extensions are dis...
sfr = "P4MAP01", "Memory", 0x1e0, 2, base=16, modified sfr = "P4MAP23", "Memory", 0x1e2, 2, base=16, modified sfr = "P4MAP45", "Memory", 0x1e4, 2, base=16, modified sfr = "P4MAP67", "Memory", 0x1e6, 2, base=16, modified sfr = "P4MAP0", "Memory", ...
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