HT85F2270 datasheet(217/226 Pages) HOLTEK

217 / 226 page

Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

37 Instruction Set

Introduction

All instructions are binary code compatible and perform the same functions as they do within

the industry standard 8051. The following tables give a summary of instruction cycles of the

HT85XXX microcontroller core.

The following two tables contain notes on mnemonics used in Instruction set.

Notes on Data Addressing Modes

Symbol

Description

Working register R0~R7.

direct

One of 1�8 internal RA� locations or an� Special Function Register.

@Ri

Indirect internal or external RA� location addressed b� register R0 or R1.

#data

8-bit constant included in instruction (immediate operand).

#data 16

16-bit constant included as b�tes � and � of instruction (immediate operand).

bit

One of 128 software flags located in internal RAM, or any flag of bit-addressable Special Function

Registers� including I/O pins and status word.

Accumulator.

Notes on Program Addressing Modes

Symbol

Description

addr16

Destination address for LCALL or LJ�P� can be an�where within the 64-Kb�te page of program

memor� address space.

addr11

Destination address for ACALL or AJ�P� within the same �-Kb�te page of program memor� as the

first byte of the following instruction.

rel

SJ�P and all conditional jumps include an 8-bit offset b�te. Its range is +1�7/-1�8 b�tes relative to

the first byte of the following instruction.

The following tables show instruction hexadecimal codes, number of bytes and machine cycles that

each instruction takes to be executed. Note the number of cycles is given for no program memory

wait states.

HT85F2270 Datasheet(PDF) 217 Page - Holtek Semiconductor Inc

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