DP80390 datasheet(7/84 Pages) DCD

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DP80390 Instructions set details

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1. OVERVIEW

1.1. DOCUMENT STRUCTURE.

Document contains brief description of DP80390 instructions. This manual is

intended for design engineers who are planning to use the DP80390 HDL core in

conjunction with software assembler, compiler and debugger tools.

2. INSTRUCTIONS SET BRIEF

2.1. INSTRUCTION SET NOTES

The DP80390 has five different addressing modes: immediate, direct, register, indirect

and relative. In the immediate addressing mode the data is contained in the opcode. By

direct addressing an eight bit address is a part of the opcode, by register addressing, a

relative addressing mode is used for jump instructions.

The following tables give a survey about the instruction set cycles of the DP80390

microcontroller core. One cycle is equal to one clock period.

Table 1 and Table 2 contain notes for mnemonics used in Instruction set tables. Tables 3 -

7 show instruction hexadecimal codes, number of bytes and machine cycles that each

instruction takes to execute.

Working register R0-R7

direct

128 internal RAM locations, any Special Function Registers

@Ri

Indirect internal or external RAM location addressed by register R0 or R1

#data

8-bit constant included in instruction

#data16

16-bit constant included as bytes 2 and 3 of instruction

#data24

24-bit constant included as bytes 2,3 and 4 of instruction

bit

256 software flags, any bit-addressable l/O pin, control or status bit

Accumulator

Table 1. Notes on data addressing modes

addr24

Destination address for LCALL and LJMP may be anywhere within the 16 MB of

program memory address space in FLAT mode.

addr19

Destination address for ACALL and AJMP will be within the same 512 KB page of

program memory as the first byte of the following instruction in FLAT mode

addr16

Destination address for LCALL and LJMP may be anywhere within the 64 kB of

program memory address space in LARGE mode.

addr11

Destination address for ACALL and AJMP will be within the same 2 KB page of

program memory as the first byte of the following instruction in LARGE mode

rel

SJMP and all conditional jumps include an 8-bit offset byte. Range is +127/-128

bytes relative to the first byte of the following instruction

Table 2. Notes on program addressing modes

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