![](http://pdfasset.owneriq.net/9/fb/9fbfa399-be01-4490-812f-c791db5ef399/9fbfa399-be01-4490-812f-c791db5ef399-bg119.png)
267
Stack growing direction
jsr sub1
4bytes
24bytes(PC+FLG+size of registers used
stack size used by sta_tsk)
36bytes(PC+FLG+size of registers used
stack size used by prcv_mbx)
sta_tsk
prcv_mbx
40bytes
When use register R2R0,R3R1,A0(12bytes)
Figure 2.3:Example of Use Stack Size Calculation