7549 데이터 시트보기 (PDF) - Renesas Electronics

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7549

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Renesas Electronics 

7549 Group

On-going Routine

Interrupt request

(Note)

Store Return

Address

on Stack

M(S)←(PCH)

(S)←(S) − 1

M(S)←(PCL)

(S)←(S) − 1

Subroutine

Execute RTS

Restore Return

Address

(S)←(S) + 1

(PCL)←M(S)

(S)←(S) + 1

(PCH)←M(S)

Execute JSR

M(S)←(PCH)

(S)←(S) − 1

Store Return Address

on Stack

M(S)←(PCL)

(S)←(S) − 1

M(S)←(PS)

Store Contents of

Processor

Status Register on Stack

(S)←(S) − 1

Interrupt

Service Routine

Execute RTI

I Flag “0” to “1”

Fetch the Jump Vector

(S)←(S) + 1

(PS)←M(S)

Restore Contents of

Processor Status Register

(S)←(S) + 1

(PCL)←M(S)

(S)←(S) + 1

Restore Return

Address

(PCH)←M(S)

Note : The condition to enable the interrupt → Interrupt enable bit is “1”

Interrupt disable flag is “0”

Fig 6. Register push and pop at interrupt generation and subroutine call

Table 4 Push and pop instructions of accumulator or processor status register

Accumulator

Processor status register

Push instruction to stack

PHA

PHP

Pop instruction from stack

PLA

PLP

Rev.2.02 Mar 31, 2009 Page 9 of 81

REJ03B0202-0202

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