Operations:

Syntax:

Operation:

Operands:

Program Counter:

Opcode

Comment

Stack

LDS Rd,k

Rd = (k)

16 <= d <= 31, 0 <= k <= 127

PC = PC + 1

10100kkkddddkkkk

Description

Loads one byte from the data space to a register. The data space usually consists of the Register File, I/O memory, and SRAM, refer to the device data sheet for a detailed definition of the data space.

A 7-bit address must be supplied. The address given in the instruction is coded to a data space address as follows:

ADDR[7:0] = (INST[8], INST[8], INST[10], INST[9], INST[3], INST[2], INST[1], INST[0])

Memory access is limited to the address range 0x40...0xbf.

This instruction is not available on all devices. Refer to Appendix A.

Status Register (SREG) and Boolean Formula

I

–

T

–

H

–

S

–

V

–

N

–

Z

–

C

–

Example: 

      lds   r16,0x00  ; Load r16 with the contents of data space location 0x00
      add   r16,r17   ; add r17 to r16
      sts   0x00,r16  ; Write result to the same address it was fetched from

Words

1 (2 bytes)

Table Cycles

Name

Note: Registers r0...r15 are remapped to r16...r31.

Cycles

AVRe

N/A

AVRxm

N/A

AVRxt

N/A

AVRrc

2