PIC16F15213 datasheet(46/408 Pages) MICROCHIP

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Figure 9-10. Accessing the Stack Example 1

Filename:

10-000043A.vsd

Title:

ACCESSING THE STACK EXAMPLE 1

Last Edit:

7/30/2013

First Used:

PIC16F1508/9

Note:

STKPTR = 0x1F

Stack Reset Disabled

(STVREN = 0)

Stack Reset Enabled

(STVREN = 1)

Initial Stack Configuration:

After Reset, the stack is empty. The

empty stack is initialized so the Stack

Pointer is pointing at 0x1F. If the Stack

Overflow/Underflow Reset is enabled, the

TOSH/

TOSL register will return ‘0’. If the

Stack Overflow/Underflow Reset is

disabled, the TOSH/TOSL register will

return the contents of stack address

0x0F.

0x0000

STKPTR = 0x1F

TOSH:TOSL

0x0F

0x0E

0x0D

0x0C

0x0B

0x0A

0x09

0x08

0x07

0x06

0x04

0x05

0x03

0x02

0x01

0x00

0x1F

TOSH:TOSL

Rev. 10-000043A

7/30/2013

Figure 9-11. Accessing the Stack Example 2

Filename:

10-000043B.vsd

Title:

ACCESSING THE STACKS EXAMPLE 2

Last Edit:

7/30/2013

First Used:

PIC16F1508/9

Note:

STKPTR = 0x00

Return Address

This figure shows the stack configuration

after the first CALL or a single interrupt.

If a RETURN instruction is executed, the

return address will be placed in the

Program Counter and the Stack Pointer

decremented to the empty state (0x1F).

0x0F

0x0E

0x0D

0x0C

0x0B

0x0A

0x09

0x08

0x07

0x06

0x04

0x05

0x03

0x02

0x01

0x00

TOSH:TOSL

Rev. 10-000043B

7/30/2013

PIC16F15225/45

Memory Organization

Preliminary Datasheet

DS20006389B-page 46

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