Texas Instruments MSP430x1xx - Manual (Page 394)

Instruction Set Overview
B-44
PUSH[.W] Push word onto stack
PUSH.B Push byte onto stack
Syntax PUSH src or PUSH.W src
PUSH.B src
Operation SP – 2
→
SP
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 N: Not affected
Z: Not affected
C: Not affected
V: 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 SR ; save status register
PUSH R8 ; save R8
Example The contents of the peripheral TCDAT is saved on the stack.
PUSH.B &TCDAT ; save data from 8-bit peripheral module,
; address TCDAT, onto stack
Note: The System Stack Pointer
The system stack pointer (SP) is always decremented by two, independent
of the byte suffix.