M38850 查看數據表（PDF） - MITSUBISHI ELECTRIC

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M38850

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

3850 Group (Spec. H)

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

On-going Routine

Push return address

on stack

Interrupt request

(Note)

M (S) (PCH)

Execute JSR

(S) (S) – 1

M (S) (PCL)

(S) (S)– 1

Subroutine

POP return

address from stack

Execute RTS

(S) (S) + 1

(PCL) M (S)

(S) (S) + 1

(PCH) M (S)

M (S) (PCH)

(S) (S) – 1

M (S) (PCL)

Push return address

on stack

(S) (S) – 1

M (S) (PS)

Push contents of processor

status register on stack

(S) (S) – 1

Interrupt

Service Routine

Execute RTI

I Flag is set from “0” to “1”

Fetch the jump vector

(S) (S) + 1

(PS) M (S)

POP contents of

processor status

register from stack

(S) (S) + 1

(PCL) M (S)

(S) (S) + 1

POP return

address

from stack

(PCH) M (S)

Note: Condition for acceptance of an interrupt Interrupt enable flag is “1”

Interrupt disable flag is “0”

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

Table 5 Push and pop instructions of accumulator or processor status register

Push instruction to stack

Accumulator

Processor status register

PHA

PHP

Pop instruction from stack

PLA

PLP

8

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