Rainbow-electronics AT89C2051 Instrukcja Użytkownika Pobierz pdf (Strona 10)

Microcontroller

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Table 4.

Compare Modifiers

Notes: 1. These instructions must immediately follow a CMP instruction.

2. NOT instruction is used to implement explicit NE.

Table 5.

Jump Instructions

Note: 1. Switch table format: addr1, value1, addr2, value2, ... 0, default addr

Table 6.

Stack Manipulation Instructions

Note: 1. Explicit POP instruction are not required since various addressing modes use and remove the top item on stack.

Name Description

LT ACC = 1 if less than (signed)

LE ACC = 1 if less than or equal (signed)

GT ACC = 1 if greater than (signed)

GE ACC = 1 if greater than of equal (signed)

ULT ACC = 1 if lower than (unsigned)

ULE ACC = 1 if lower than or same (unsigned)

UGT ACC = 1 if higher than (unsigned)

UGE ACC = 1 if higher than or same (unsigned)

Name Description

JMP Long jump (16-bit absolute)

JZ Long jump if ACC=0 (16-bit absolute)

JNZ Long jump if ACC!=0 (16-bit absolute)

SJMP Short jump (8-bit PC offset)

SJZ Short jump if ACC=0 (8-bit PC offset)

SJNZ Short jump if ACC!=0 (8-bit PC offset)

IJMP Indirect jump (Address in ACC)

SWITCH Jump through switch table (ACC=value, INDEX=table)

Name Description

CALL Call subroutine (16-bit absolute address)

RET Return from subroutine

ALLOC Allocate space on stack (8-bit value)

FREE Release space on stack (8-bit value)

PUSHA Push ACC on stack

PUSHI Push INDEX on stack

TAS Copy ACC to SP

TSA Copy SP to ACC

1 2 ... 5 6 7 8 9 10 11

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Rainbow-electronics AT89C2051 Instrukcja Użytkownika Strona 10