7545 datasheet(10/62 Pages) RENESAS

Part #	7545

Description	SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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10 / 62 page

Rev.1.06

Mar 07, 2008

Page 10 of 59

REJ03B0140-0106

7545 Group

Fig. 8 Register push and pop at interrupt generation and subroutine call

Execute JSR

On-going Routine

M (S)

(PCH)

M (S)

(PCL)

Execute RTS

(PCL)

M (S)

(S)

(S + 1)

(S)

(S + 1)

(PCH)

M (S)

Subroutine

Restore Return

Address

Store Return Address

on Stack

M (S)

(PS)

Execute RTI

(PS)

M (S)

Interrupt

Service Routine

Restore Contents of

Processor Status Register

M (S)

(PCH)

(S)

(S - 1)

M (S)

(PCL)

M (S)

(PCH)

M (S)

Restore Return

Address

I Flag “0” to “1”

Fetch the Jump Vector

Store Return Address

on Stack

Store Contents of Processor

Status Register on Stack

Interrupt request

(Note)

Note : The condition to enable the interrupt

Interrupt enable bit is “1”

Interrupt disable flag is “0”

(S)

(S - 1)

(S)

(S - 1)

(S)

(S + 1)

(S)

(S + 1)

(S)

(S + 1)

(S)

(S - 1)

(S)

(S - 1)

Table 5

Push and pop instructions of accumulator or processor status register

Push instruction to stack

Pop instruction from stack

Accumulator

PHA

PLA

Processor status register

PHP

PLP

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