TMP86PM74AFG datasheet(51/190 Pages) TOSHIBA

tên linh kiện	TMP86PM74AFG

Giải thích chi tiết về linh kiện	8 Bit Microcontroller

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Page 41

TMP86PM74AFG

Figure 3-3 Save/store register using PUSH and POP instructions

3.4.2.2

Using data transfer instructions

To save only a specific register without nested interrupts, data transfer instructions are available.

Figure 3-4 Saving/Restoring General-purpose Registers under Interrupt Processing

3.4.3

Interrupt return

Interrupt return instructions [RETI]/[RETN] perform as follows.

Example :Save/store register using data transfer instructions

PINTxx:

(GSAVA), A

; Save A register

(interrupt processing)

A, (GSAVA)

; Restore A register

RETI

; RETURN

[RETI]/[RETN] Interrupt Return

1. Program counter (PC) and program status word

(PSW, includes IMF) are restored from the stack.

2. Stack pointer (SP) is incremented by 3.

PCL

PCH

PSW

At acceptance of

an interrupt

At execution of

PUSH instruction

At execution of

RETI instruction

At execution of

POP instruction

b-4

b-3

b-2

b-1

PCL

PCH

PSW

PCL

PCH

PSW

Address

(Example)

b-5

Interrupt

acceptance

Interrupt

service task

Restoring

registers

Saving

registers

Interrupt return

Saving/Restoring general-purpose registers using PUSH/POP data transfer instruction

Main task

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