1 b y t e = 8 b i t 1 byte = 8 bit 1byte=8bit
ASCII 码共计有 128 个，用 7 个 bit 可以表示，加前面一个 bit 用作校验位，随着工程实践成为标准。
人编程时，一般面对的最小单位就是字节了。
X86 寻址的最小单位也是 1 byte。
tips
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附录 ASCII 码ASCII 码 - 百度百科
时尚的蚂蚁(二进制)Oct(八进制)Dec(十进制)Hex(十六进制)缩写/字符解释0000 00000000x00NUL(null)空字符0000 00010110x01SOH(start of headline)标题开始0000 00100220x02STX (start of text)正文开始0000 00110330x03ETX (end of text)正文结束0000 01000440x04EOT (end of transmission)传输结束0000 01010550x05ENQ (enquiry)请求0000 01100660x06ACK (acknowledge)收到通知0000 01110770x07BEL (bell)响铃0000 100001080x08BS (backspace)退格0000 100101190x09HT (horizontal tab)水平制表符0000 1010012100x0ALF (NL line feed, new line)换行键0000 1011013110x0BVT (vertical tab)垂直制表符0000 1100014120x0CFF (NP form feed, new page)换页键0000 1101015130x0DCR (carriage return)回车键0000 1110016140x0ESO (shift out)不用切换0000 1111017150x0FSI (shift in)启用切换0001 0000020160x10DLE (data link escape)数据链路转义0001 0001021170x11DC1 (device control 1)设备控制10001 0010022180x12DC2 (device control 2)设备控制20001 0011023190x13DC3 (device control 3)设备控制30001 0100024200x14DC4 (device control 4)设备控制40001 0101025210x15NAK (negative acknowledge)拒绝接收0001 0110026220x16SYN (synchronous idle)同步空闲0001 0111027230x17ETB (end of trans. block)结束传输块0001 1000030240x18CAN (cancel)取消0001 1001031250x19EM (end of medium)媒介结束0001 1010032260x1ASUB (substitute)代替0001 1011033270x1BESC (escape)换码(溢出)0001 1100034280x1CFS (file separator)文件分隔符0001 1101035290x1DGS (group separator)分组符0001 1110036300x1ERS (record separator)记录分隔符0001 1111037310x1FUS (unit separator)单元分隔符0010 0000040320x20(space)空格0010 0001041330x21!叹号0010 0010042340x22"双引号0010 0011043350x23#井号0010 0100044360x24$美元符0010 0101045370x25%百分号0010 0110046380x26&和号0010 0111047390x27’闭单引号0010 1000050400x28(开括号0010 1001051410x29)闭括号0010 1010052420x2A*星号0010 1011053430x2B+加号0010 1100054440x2C,逗号0010 1101055450x2D-减号/破折号0010 1110056460x2E.句号0010 1111057470x2F/斜杠0011 0000060480x300字符00011 0001061490x311字符10011 0010062500x322字符20011 0011063510x333字符30011 0100064520x344字符40011 0101065530x355字符50011 0110066540x366字符60011 0111067550x377字符70011 1000070560x388字符80011 1001071570x399字符90011 1010072580x3A:冒号0011 1011073590x3B;分号0011 1100074600x3C<小于0011 1101075610x3D=等号0011 1110076620x3E>大于0011 1111077630x3F?问号0100 00000100640x40@电子邮件符号0100 00010101650x41A大写字母A0100 00100102660x42B大写字母B0100 00110103670x43C大写字母C0100 01000104680x44D大写字母D0100 01010105690x45E大写字母E0100 01100106700x46F大写字母F0100 01110107710x47G大写字母G0100 10000110720x48H大写字母H0100 10010111730x49I大写字母I0100 10100112740x4AJ大写字母J0100 10110113750x4BK大写字母K0100 11000114760x4CL大写字母L0100 11010115770x4DM大写字母M0100 11100116780x4EN大写字母N0100 11110117790x4FO大写字母O0101 00000120800x50P大写字母P0101 00010121810x51Q大写字母Q0101 00100122820x52R大写字母R0101 00110123830x53S大写字母S0101 01000124840x54T大写字母T0101 01010125850x55U大写字母U0101 01100126860x56V大写字母V0101 01110127870x57W大写字母W0101 10000130880x58X大写字母X0101 10010131890x59Y大写字母Y0101 10100132900x5AZ大写字母Z0101 10110133910x5B[开方括号0101 11000134920x5C反斜杠0101 11010135930x5D]闭方括号0101 11100136940x5E^脱字符0101 11110137950x5F_下划线0110 00000140960x60`开单引号0110 00010141970x61a小写字母a0110 00100142980x62b小写字母b0110 00110143990x63c小写字母c0110 010001441000x64d小写字母d0110 010101451010x65e小写字母e0110 011001461020x66f小写字母f0110 011101471030x67g小写字母g0110 100001501040x68h小写字母h0110 100101511050x69i小写字母i0110 101001521060x6Aj小写字母j0110 101101531070x6Bk小写字母k0110 110001541080x6Cl小写字母l0110 110101551090x6Dm小写字母m0110 111001561100x6En小写字母n0110 111101571110x6Fo小写字母o0111 000001601120x70p小写字母p0111 000101611130x71q小写字母q0111 001001621140x72r小写字母r0111 001101631150x73s小写字母s0111 010001641160x74t小写字母t0111 010101651170x75u小写字母u0111 011001661180x76v小写字母v0111 011101671190x77w小写字母w0111 100001701200x78x小写字母x0111 100101711210x79y小写字母y0111 101001721220x7Az小写字母z0111 101101731230x7B{开花括号0111 110001741240x7C|垂线0111 110101751250x7D}闭花括号0111 111001761260x7E~波浪号0111 111101771270x7FDEL (delete)删除【LIXIFUN - 为啥一个字节等于八比特】