Raws li cov khoom, MSB (byte) feem ntau yog byte deb tshaj plaws rau sab laug, lossis byte kis thawj zaug hauv ib ntu. Thaum MSB nyob rau hauv ib ntus nyob deb tshaj plaws rau sab laug (lossis thawj),tsawg kawg me ntsis lossis byte (LSB) feem ntau yog qhov deb tshaj plaws rau sab xis (lossis kawg).
Puas yog UART MSB lossis LSB ua ntej?
SCI ntawm F28335 ib txwm xa LSB ua ntej, MSB kawg (saib SPRUFZ5A, p. 15, Daim duab 1-3). Yog tias koj xav tau nws xa MSB ua ntej, koj yuav tsum thim rov qab qhov kev txiav txim me ntsis ua ntej sau lo lus rau TXBUF.
I2C puas xa MSB lossis LSB ua ntej?
Raws li lwm cov ntaub ntawv, qhov chaw nyob tau xa mus ua ntu zus, pib nrog qhov tseem ceeb tshaj plaws (MSB) thiab xaus nrog qhov tseem ceeb me ntsis (LSB). Txhua tus qhev ntaus ntawv, uas txuas nrog lub npav I2C, yuav tsum muaj qhov chaw nyob tshwj xeeb.
Koj paub li cas yog MSB yog 1?
Kom tau MSB ntawm tus lej, txav thawj me ntsis ntawm 1 mus rau qhov kev txiav txim siab tshaj plaws. Sab laug ua haujlwm 1 khoom - 1 zaug thiab khw ua rau qee qhov sib txawv hais msb=1 << (ntsis - 1). Yog tias bitwise THIAB ua haujlwm num & msb ntsuas rau 1 ces MSB ntawm tus lej raug teeb tsa tsis yog.
Qhov twg yog thawj me ntsis hauv ib byte?
A byte yog ib pawg ntawm 8 ntsis. Ib me ntsis yog chav tsev yooj yim tshaj plaws thiab tuaj yeem yog 1 lossis 0 . Ib byte tsis yog 8 qhov tseem ceeb ntawm 0 thiab 1, tab sis 256 (2 8) sib txawv ua ke (siv permutations) xws li 00000000 ntawm e.g. 01010101 to 11111111.
