ST7FLITE25F2M6 datasheet(32/166 Pages) STMICROELECTRONICS

Part #	ST7FLITE25F2M6

Description	8-bit microcontroller with single voltage Flash memory, data EEPROM, ADC, Timers, SPI

PDF	166 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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32 / 166 page

Central processing unit

ST7LITE20F2 ST7LITE25F2 ST7LITE29F2

32/166

Doc ID 8349 Rev 5

The stack is used to save the return address during a subroutine call and the CPU context

during an interrupt. The user may also directly manipulate the stack by means of the PUSH

and POP instructions. In the case of an interrupt, the PCL is stored at the first location

pointed to by the SP. Then the other registers are stored in the next locations as shown in

Figure 11:

●

When an interrupt is received, the SP is decremented and the context is pushed on the

stack.

●

On return from interrupt, the SP is incremented and the context is popped from the

stack.

A subroutine call occupies two locations and an interrupt five locations in the stack area.

Figure 11. Stack manipulation example

PCH

PCL

PCH

PCL

PCH

PCL

PCH

PCL

PCH

PCL

CALL

Subroutine

Interrupt

Event

PUSH Y

POP Y

IRET

RET

or RSP

@ 01FFh

@ 0180h

Stack higher address = 01FFh

Stack lower address =

0180h

ST7FLITE25F2M6 Datasheet(PDF) 32 Page - STMicroelectronics

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