HD6413308 Hitachi Semiconductor, HD6413308 Datasheet - Page 89

• Manufacturer Part Number: HD6413308
• Description: Hitachi Single-Chip MicroComputer
• Manufacturer: Hitachi Semiconductor

Figure 4-7 shows an example of damage caused when the stack pointer contains an odd address.
SP-4
SP-3
SP-2
SP-1
SP(R7)
PC
CCR
SP
Notes:
* Ignored on return.
:
:
:
:
Program counter
Condition code register
Stack pointer
1.
2.
The PC contains the address of the first instruction
executed after return.
Registers must be saved and restored by word
access at an even address.
Before interrupt
is accepted
Figure 4-6. Usage of Stack in Interrupt Handling
Stack area
Pushed onto stack
SP+3
SP(R7)
SP+1
SP+2
SP+4
74
PC (upper byte)
After interrupt
is accepted
PC (lower byte)
CCR
CCR *
Even address