PIC18F1220ESLASHSSSQTP datasheet(222/308 Pages) MICROCHIP

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PIC18F1220/1320

DS39605F-page 220

POP

Pop Top of Return Stack

Syntax:

[ label ]

POP

Operands:

None

Operation:

(TOS)

→ bit bucket

Status Affected:

None

Encoding:

0000

0110

Description:

The TOS value is pulled off the

return stack and is discarded. The

TOS value then becomes the

previous value that was pushed

onto the return stack.

This instruction is provided to

enable the user to properly manage

the return stack to incorporate a

software stack.

Words:

Cycles:

Q Cycle Activity:

Decode

operation

Pop TOS

value

operation

Example:

POP

GOTO

NEW

Before Instruction

TOS

0x0031A2

Stack (1 level down)

0x014332

After Instruction

TOS

0x014332

NEW

PUSH

Push Top of Return Stack

Syntax:

[ label ]

PUSH

Operands:

None

Operation:

(PC + 2)

→ TOS

Status Affected:

None

Encoding:

0000

0101

Description:

The PC + 2 is pushed onto the top

of the return stack. The previous

TOS value is pushed down on the

stack.

This instruction allows implement-

ing a software stack by modifying

TOS and then pushing it onto the

return stack.

Words:

Cycles:

Q Cycle Activity:

Decode

Push

PC + 2 onto

return stack

operation

Example:

PUSH

Before Instruction

TOS

0x00345A

0x000124

After Instruction

0x000126

TOS

0x000126

Stack (1 level down)

0x00345A

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