Operations:

Syntax:

Operation:

Operands:

Program Counter:

Opcode

Comment

Stack

STS k,Rr

(k) = Rr

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

PC = PC + 1

10101kkkddddkkkk

Description

Stores one byte from a Register to the data space. 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 of the data segment.

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

1