Texas Instruments MSP430x4xx Family User Manual page 276

Address Instructions
* CLRA
Syntax
Operation
Emulation
Description
Status Bits
Example
4-162 16-Bit MSP430X CPU
Clear 20-bit destination register
CLRA Rdst
0 −> Rdst
MOVA #0,Rdst
The destination register is cleared.
Status bits are not affected.
The 20-bit value in R10 is cleared.
CLRA R10 ; 0 −> R10