HD6433713 datasheet(83/324 Pages) RENESAS

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3.2.7 Return from an Interrupt

After completion of interrupt handling, the handler routine ends by executing an RTE instruction,

to resume the original program from the point the interrupt. When RTE is executed, the values

saved on the stack are restored to CCR and PC as shown in figure 3-6. Instruction execution

resumes from the address indicated in PC.

Figure 3-6 Stack State When RTE Instruction is Executed

3.2.8 Interrupt Response Time

Table 3-4 shows the number of wait states after an interrupt request flag is set and until the first

instruction of the interrupt handler is executed.

Table 3-4 Interrupt Wait States

No.

Item

States

Waiting time for completion of current instruction*

1 to 13

Saving of PC and CCR to stack

Vector fetch

Instruction fetch

Internal processing

Total

15 to 27

Note: * Not including EEPMOV instruction.

(Processing of RTE instruction)

(Stack state)

Memory contents of address

indicated in SP are sent to CCR.

SP value +2

Memory contents of address

indicated in SP are sent to PC.

SP value +2

CCR

CCR *

SP (R7)

SP + 1

SP + 2

SP + 3

SP + 4

SP – 4

SP – 3

SP – 2

SP – 1

SP (R7)

PC H

PC L

CCR

CCR *

PC H

PC L

Stack

area

Stack

area

CCR and PC

values restored

Before RTE instruction is executed

After RTE instruction is executed

∗ Ignored on return from interrupt.

Note:

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