Datasheet

SP
old
SP
old
SP
1
PUSHSP
Thestackpointerischangedafter
aPUSHSP instruction.
SP
1
SP
2
POP SP
ThestackpointerisnotchangedafteraPOP SP
instruction.ThePOP SP instructionplacesSP1intothe
stackpointerSP (SP2=SP1)
Item n-1
Item.19:16
Item.15:0
SP
old
SP
I3
I1
I2
I3
0xxxh
0xxxh - 2
0xxxh - 4
0xxxh - 6
0xxxh - 8
I1
I2
SP
0123h
SP
I1
I2
I3
SP
PUSH #0123h
POP R8Address
0Stack Pointer Bits 19 to 1
19 1 0
MOV.W2(SP),R6;CopyItemI2toR6
MOV.WR7,0(SP);OverwriteTOSwithR7
PUSH#0123h;Put0123honstack
POPR8;R8=0123h
CPU Registers www.ti.com
Figure 4-6 shows the stack usage. Figure 4-7 shows the stack usage when 20-bit address words are
pushed.
Figure 4-5. Stack Pointer
Figure 4-6. Stack Usage
Figure 4-7. PUSHX.A Format on the Stack
The special cases of using the SP as an argument to the PUSH and POP instructions are described and
shown in Figure 4-8.
Figure 4-8. PUSH SP, POP SP Sequence
120
CPUX SLAU144J–December 2004–Revised July 2013
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