Atmel AVR User Manual

125. SWAP – Swap Nibbles
125.1. Description
Swaps high and low nibbles in a register.
Operation:
(i) R(7:4) ← Rd(3:0), R(3:0) ← Rd(7:4)
Syntax: Operands: Program Counter:
(i) SWAP Rd 0 ≤ d ≤ 31 PC ← PC + 1
16-bit Opcode:
1001 010d dddd 0010
125.2. Status Register (SREG) and Boolean Formula
I T H S V N Z C
– – – – – – – –
R (Result) equals Rd after the operation.
Example:
inc r1 ; Increment r1
swap r1 ; Swap high and low nibble of r1
inc r1 ; Increment high nibble of r1
swap r1 ; Swap back
Words 1 (2 bytes)
Cycles 1
Atmel AVR Instruction Set Manual [OTHER]
Atmel-0856L-AVR-Instruction-Set-Manual_Other-11/2016
185

Atmel AVR Specifications

General

Architecture	8-bit RISC
SRAM	Up to 16 KB
Clock Speed	Up to 20 MHz
Operating Voltage	1.8V to 5.5V
ADC	10-bit ADC
Communication Interfaces	SPI, I2C, USB
Packages	DIP, SOIC, QFN
Special Features	Watchdog Timer
Flash Memory	1KB to 256KB
EEPROM	64B to 4KB