38K2 datasheet(162/358 Pages) RENESAS

162 / 358 page

2.2 Interrupt

Rev.2.00

Oct 15, 2006

page 13 of 112

38K2 Group

REJ09B0338-0200

APPLICATION

(1)

Processing upon acceptance of interrupt request

Upon acceptance of an interrupt request, the following operations are automatically performed.

➀The processing being executed is stopped.

➁The contents of the program counter and the processor status register are pushed onto the stack

area. Figure 2.2.8 shows the changes of the stack pointer and the program counter upon acceptance

of an interrupt request.

➂Concurrently with the push operation, the jump destination address (the beginning address of the

interrupt processing routine) of the occurring interrupt stored in the vector address is set in the

program counter, then the interrupt processing routine is executed.

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

cleared to “0”. The interrupt disable flag is set to “1” so that multiple interrupts are disabled.

Accordingly, for executing the interrupt processing routine, it is necessary to set the jump destination

address in the vector area corresponding to each interrupt.

Fig. 2.2.8 Changes of stack pointer and program counter upon acceptance of interrupt request

Interrupt disable flag = “0”

Program counter

Stack pointer

Program counter (low-order)

Program counter (high-order)

PCL

PCH

(S)

Program counter

Stack pointer

PCL

PCH

(S) – 3

Vector address

(from Interrupt vector area)

Interrupt disable flag = “1”

Interrupt

request is

accepted

Stack area

(S)

Processor status register

Program counter (low-order)

Program counter (high-order)

(S)

(s) – 3

Stack area

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