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Atmel AVR User Manual

Atmel AVR
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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

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Atmel AVR Specifications

General IconGeneral
Architecture8-bit RISC
SRAMUp to 16 KB
Clock SpeedUp to 20 MHz
Operating Voltage1.8V to 5.5V
ADC10-bit ADC
Communication InterfacesSPI, I2C, USB
PackagesDIP, SOIC, QFN
Special FeaturesWatchdog Timer
Flash Memory1KB to 256KB
EEPROM64B to 4KB

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