Texas Instruments MSP430x1xx User Manual page 91

PUSH[.W] Push word onto stack
PUSH.B Push byte onto stack
Syntax PUSH
PUSH.B
SP − 2 → SP
Operation
src → @SP
Description The stack pointer is decremented by two, then the source operand is moved
to the RAM word addressed by the stack pointer (TOS).
Status Bits Status bits are not affected.
Mode Bits OSCOFF, CPUOFF, and GIE are not affected.
Example The contents of the status register and R8 are saved on the stack.
PUSH
PUSH
Example The contents of the peripheral TCDAT is saved on the stack.
PUSH.B
Note: The System Stack Pointer
The system stack pointer (SP) is always decremented by two, independent
of the byte suffix.
src or PUSH.W src
src
SR ; save status register
R8 ; save R8
&TCDAT ; save data from 8-bit peripheral module,
; address TCDAT, onto stack
Instruction Set
RISC 16−Bit CPU
3-55