TMP86CS44UG datasheet(49/172 Pages) TOSHIBA

Numer części	TMP86CS44UG

Szczegółowy opis	8 Bit Microcontroller

PDF	172 Pages

Scroll/Zoom	100%

Producent	TOSHIBA [Toshiba Semiconductor]

Strona internetowa	http://www.semicon.toshiba.co.jp/eng

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Page 39

TMP86CS44UG

3.4.2.1 Using PUSH and POP instructions

If only a specific register is saved or interrupts of the same source are nested, general-purpose registers

can be saved/restored using the PUSH/POP instructions.

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.

Example :Save/store register using PUSH and POP instructions

PINTxx:

PUSH

; Save WA register

(interrupt processing)

POP

; Restore WA register

RETI

; RETURN

Example :Save/store register using data transfer instructions

PINTxx:

(GSAVA), A

; Save A register

(interrupt processing)

A, (GSAVA)

; Restore A register

RETI

; RETURN

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

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