HD6473837H Datasheet, PDF (96/562 Pages) Renesas Technology Corp – Hardware Manual

SP – 4
SP – 3
SP – 2
SP – 1
SP (R7)
Stack area
SP (R7)
SP + 1
SP + 2
SP + 3
SP + 4
CCR
CCR*
PC_H
PC_L
Even address
Prior to start of interrupt
exception handling
PC and CCR
saved to stack
Notation:
PC_H: Upper 8 bits of program counter (PC)
PC_L: Lower 8 bits of program counter (PC)
CCR: Condition code register
SP: Stack pointer
After completion of interrupt
exception handling
Notes: 1. PC shows the address of the first instruction to be executed upon
return from the interrupt handling routine.
2. Register contents must always be saved and restored by word access,
starting from an even-numbered address.
* Ignored on return from interrupt.
Figure 3.5 Stack State after Completion of Interrupt Exception Handling
Figure 3.6 shows a typical interrupt sequence where the program area is in the on-chip ROM and
the stack area is in the on-chip RAM.
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