D12320VF25IV Datasheet, PDF (70/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 2 CPU
Stack Structure: In advanced mode, when the program counter (PC) is pushed onto the stack in a
subroutine call, and the PC, condition-code register (CCR), and extended control register (EXR)
are pushed onto the stack in exception handling, they are stored as shown in figure 2.2. When
EXR is invalid, it is not pushed onto the stack. For details, see section 4, Exception Handling.
SP
Reserved
PC
(24 bits)
SP
*2
(SP )
EXR^*1
Reserved^{*1 *3}
CCR
PC
(24 bits)
(a) Subroutine Branch
(b) Exception Handling
Notes: 1. When EXR is not used it is not stored on the stack.
2. SP when EXR is not used.
3. Ignored when returning.
Figure 2.2 Stack Structure in Advanced Mode
Rev.6.00 Sep. 27, 2007 Page 38 of 1268
REJ09B0220-0600