SN8A1702AX datasheet(29/112 Pages) SONIX

29 / 112 page

Preliminary

SN8P1702A/SN8P1703A

8-bit micro-controller build-in 12-bit ADC

SONiX TECHNOLOGY CO., LTD

Page 29

Revision 0.5

STACK OPERATIONS

OVERVIEW

The stack buffer of SN8P1702A/SN8P1703A has 8-level high area and each level is 12-bits length. This buffer is

designed to save and restore program counter’s (PC) data when interrupt service is executed. The STKP register is a

pointer designed to point active level in order to save or restore data from stack buffer for kernel circuit. The STKnH

and STKnL are the 12-bit stack buffers to store program counter (PC) data.

Figure 3-3 Stack-Save and Stack-Restore Operation

STACK BUFFER

STK7H

STK6H

STK5H

STK4H

STK3H

STK2H

STK1H

STK0H

STK7L

STK6L

STK5L

STK4L

STK3L

STK2L

STK1L

STK0L

STKP = 0

STKP = 1

STKP = 2

STKP = 3

STKP = 4

STKP = 5

STKP = 6

STKP = 7

STKP - 1

STKP + 1

CALL /

interrupt

RET /

RETI

STKP

PCH

PCL

STKP

STACK BUFFER

STK7H

STK6H

STK5H

STK4H

STK3H

STK2H

STK1H

STK0H

STK7L

STK6L

STK5L

STK4L

STK3L

STK2L

STK1L

STK0L

STK7H

STK6H

STK5H

STK4H

STK3H

STK2H

STK1H

STK0H

STK7L

STK6L

STK5L

STK4L

STK3L

STK2L

STK1L

STK0L

STKP = 0

STKP = 1

STKP = 2

STKP = 3

STKP = 4

STKP = 5

STKP = 6

STKP = 7

STKP = 0

STKP = 1

STKP = 2

STKP = 3

STKP = 4

STKP = 5

STKP = 6

STKP = 7

STKP - 1

STKP + 1

STKP - 1

STKP + 1

CALL /

interrupt

RET /

RETI

STKP

PCH

PCL

PCH

PCL

STKP

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