7477 datasheet(70/354 Pages) RENESAS

70 / 354 page

7470/7471/7477/7478 GROUP USER’S MANUAL

HARDWARE

1.11 Interrupts

1-53

Program counter

Stack pointer

Stack area

Program counter (high-order)

Program counter (low-order)

(S)

(from Interrupt vector area)

Vector address

(S) – 3

Processor status register

Program counter (low-order)

Program counter (high-order)

Interrupt

request is

accepted

Interrupt disable flag = “1”

Interrupt disable flag = “0”

PCH

PCL

PCH

PCL

(S)

(S) – 3

(S)

Stack area

Program counter

Stack pointer

(2) Processing upon acceptance of interrupt

When an interrupt is accepted, the following operations are automatically performed.

1 The processing being executed is interrupted.

2 The contents of the Program counter and the Processor status register are pushed to the stack

area.

Figure 1.11.3 shows a change of the contents of the Program counter and the Stack pointer upon

acceptance of the interrupt.

3 The vector address (start address of the interrupt processing routine) stored in the vector area

corresponding to the generated interrupt concurrently with pushing is set in the Program counter

and the interrupt processing routine is executed.

4 After the interrupt processing routine is started, the corresponding interrupt request bit is automatically

cleared to “0.” The interrupt disable flag is set to “1,” thereby disabling a multi-interrupt.

To execute the interrupt processing routine, it is necessary to set a vector address in the vector

area corresponding to each interrupt beforehand.

Fig. 1.11.3 Changes of contents of Program counter and Stack pointer upon acceptance of interrupt

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