ST7263BEX datasheet(31/186 Pages) STMICROELECTRONICS

Part #	ST7263BEx

Description	Low speed USB 8-bit MCU family with up to 32 KB Flash/ROM, DFU capability, 8-bit ADC, WDG, timer, SCI and I²C

PDF	186 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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31 / 186 page

ST7263Bxx

Central processing unit

Doc ID 7516 Rev 8

31/186

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

Figure 10.

●

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 10.

Stack manipulation example

Figure 11.

CPU registers

PCH

PCL

PCH

PCL

PCH

PCL

PCH

PCL

PCH

PCL

CALL

Subroutine

Interrupt

Event

PUSH Y

POP Y

IRET

RET

or RSP

@ 017Fh

@ 0100h

Stack Higher Address = 017Fh

Stack Lower Address = 0100h

ACCUMULATOR

X INDEX REGISTER

Y INDEX REGISTER

STACK POINTER

CONDITION CODE REGISTER

PROGRAM COUNTER

1 1 HI

RESET VALUE = RESET VECTOR @ FFFEh-FFFFh

PCH

PCL

RESET VALUE = STACK HIGHER ADDRESS

RESET VALUE = 1X

11 X 1 X X

RESET VALUE = XXh

X = undefined value

ST7263BEx Datasheet(PDF) 31 Page - STMicroelectronics

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