122. STS (16-bit) – Store Direct to Data Space
122.1. Description
Stores one byte from a Register to the data space. For parts with SRAM, the data space consists of the
Register File, I/O memory, and internal SRAM (and external SRAM if applicable). For parts without
SRAM, the data space consists of the Register File only. In some parts the Flash memory has been
mapped to the data space and can be written using this command. The EEPROM has a separate
address 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 in all devices. Refer to the device specific instruction set summary.
Operation:
(i) (k) ← Rr
Syntax: Operands: Program Counter:
(i) STS k,Rr 16 ≤ r ≤ 31, 0 ≤ k ≤ 127 PC ← PC + 1
16-bit Opcode:
1010 1kkk dddd kkkk
122.2. Status Register (SREG) and Boolean Formula
I T H S V N Z C
– – – – – – – –
Example:
lds r16,$00 ; Load r16 with the contents of data space location $00
add r16,r17 ; add r17 to r16
sts $00,r16 ; Write result to the same address it was fetched from
Words 1 (2 bytes)
Cycles 1
Note: Registers r0...r15 are remapped to r16...r31
Atmel AVR Instruction Set Manual [OTHER]
Atmel-0856L-AVR-Instruction-Set-Manual_Other-11/2016
180
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