Ultra Start 16xx Manuel d'utilisateur télécharger pdf (Page 5)

MEB/0404

Memory

Write Less Code

Other MCU

movf ADCRESH,W

movwf RAMH

bsf STATUS 0x20

movf ADCRESL,W

bcf STATUS 0x20

movwf RAML

84 bits / 24 cycles

10-bits

10-bit

ADC

MSP430

mov ADC10MEM,RAM

48 bits / 6 cycles

The example shows the effectiveness of the MSP430’s 16-bit architecture in a common

function, the process of servicing an integrated 10-bit ADC saving the conversion code to

RAM.

•The MSP430 can move any 8 or 16-bit value from any memory location to any memory location

in the entire address space in one instruction.

•The 8-bit MCU requires numerous instructions, and is forced to break the 10-bit ADC output into

two bytes. The limitation of an accumulator based architecture is also shown with data always

passing through the accumulator. The need to always pass data through the accumulator and

being forced to change memory pages with the 8-bit MCU increases code size, reduces

performance and increases power consumption.

•A question to ask is if whether your application manipulates data greater than 8-bits, i.e. 10-bit+

data converters.

1 2 3 4 5 6 7 8 9 10 ... 36 37

Pas de commentaire

Ultra Start 16xx Manuel d'utilisateur Page 5