HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 86

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

Figure 3.5 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.
76
SP – 4
SP – 3
SP – 2
SP – 1
SP (R7)
Legend:
PC
PC
CCR:
SP:
Notes:
H
L
:
:
Upper 8 bits of program counter (PC)
Lower 8 bits of program counter (PC)
Condition code register
Stack pointer
2.
1.
Figure 3.4 Stack State after Completion of Interrupt Exception Handling
Register contents must always be saved and restored by word access, starting from
an even-numbered address.
PC shows the address of the first instruction to be executed upon return from the interrupt
handling routine.
Prior to start of interrupt
exception handling
Stack area
saved to stack
PC and CCR
SP (R7)
SP + 1
SP + 2
SP + 3
SP + 4
After completion of interrupt
exception handling
CCR
CCR
PC
PC
H
L
Even address