HD6433935 Hitachi, HD6433935 Datasheet - Page 89

• Manufacturer Part Number: HD6433935
• Description: 8-Bit MICROCONTROLLER
• Manufacturer: Hitachi

Figure 3-5 shows a typical interrupt sequence.
SP – 4
SP – 3
SP – 2
SP – 1
SP (R7)
Notation:
PC
PC
CCR:
SP:
Notes:
H
L
Figure 3-4 Stack State after Completion of Interrupt Exception Handling
:
:
2.
*
1.
Upper 8 bits of program counter (PC)
Lower 8 bits of program counter (PC)
Condition code register
Stack pointer
Register contents must always be saved and restored by word access,
starting from an even-numbered address.
Ignored on return.
Prior to start of interrupt
PC shows the address of the first instruction to be executed upon
return from the interrupt handling routine.
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
77