PIC18LF4420T-I/SO 查看數據表（PDF） - Microchip Technology

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PIC18LF4420T-I/SO

28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC18F2420/2520/4420/4520

POP

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Q Cycle Activity:

Q1

Decode

Pop Top of Return Stack

POP

None

(TOS) → bit bucket

None

0000 0000 0000 0110

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.

1

1

Q2

No

operation

Q3

POP TOS

value

Q4

No

operation

Example:

POP

GOTO

Before Instruction

TOS

Stack (1 level down)

After Instruction

TOS

PC

NEW

= 0031A2h

= 014332h

= 014332h

= NEW

PUSH

Push Top of Return Stack

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Q Cycle Activity:

Q1

Decode

PUSH

None

(PC + 2) → TOS

None

0000 0000 0000 0101

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 implementing a

software stack by modifying TOS and

then pushing it onto the return stack.

1

1

Q2

PUSH

PC + 2 onto

return stack

Q3

No

operation

Q4

No

operation

Example:

PUSH

Before Instruction

TOS

PC

After Instruction

PC

TOS

Stack (1 level down)

= 345Ah

= 0124h

= 0126h

= 0126h

= 345Ah

DS39631A-page 296

Preliminary

 2004 Microchip Technology Inc.

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