PIC18F1220ESLASHSSSQTP datasheet(223/308 Pages) MICROCHIP

223 / 308 page

DS39605F-page 221

PIC18F1220/1320

RCALL

Relative Call

Syntax:

[ label ] RCALL

Operands:

-1024

≤ n ≤ 1023

Operation:

(PC) + 2

→ TOS,

(PC) + 2 + 2n

→ PC

Status Affected:

None

Encoding:

1101

1nnn

nnnn

Description:

Subroutine call with a jump up to 1K

from the current location. First,

return address (PC + 2) is pushed

onto the stack. Then, add the 2’s

complement number ‘2n’ to the PC.

Since the PC will have incremented

to fetch the next instruction, the new

address will be PC + 2 + 2n. This

instruction is a two-cycle instruction.

Words:

Cycles:

Q Cycle Activity:

Decode

Read literal

‘n’

Push PC to

stack

Process

Data

Write to PC

operation

Example:

HERE

RCALL Jump

Before Instruction

PC =

Address (HERE)

After Instruction

PC =

Address (Jump)

TOS =

Address (HERE + 2)

RESET

Reset

Syntax:

[ label ]

RESET

Operands:

None

Operation:

Reset all registers and flags that

are affected by a MCLR Reset.

Status Affected:

All

Encoding:

0000

1111

Description:

This instruction provides a way to

execute a MCLR Reset in software.

Words:

Cycles:

Q Cycle Activity:

Decode

Start

Reset

operation

Example:

RESET

After Instruction

Registers =

Reset Value

Flags*

Reset Value

PIC18F1220E/SSSQTP Datasheet(PDF) 223 Page - Microchip Technology

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