HD6432646 Hitachi, HD6432646 Datasheet - Page 68

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

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 2-5. When
EXR is invalid, it is not pushed onto the stack. For details, see section 4, Exception Handling.
34
SP
Notes: *1
(a) Subroutine Branch
*2
*3
When EXR is not used it is not stored on the stack.
SP when EXR is not used.
Ignored when returning.
Reserved
(24 bits)
Figure 2-5 Stack Structure in Advanced Mode
PC
(SP
SP
*2
)
(b) Exception Handling
Reserved
(24 bits)
EXR
CCR
PC
*1
*1*3