Atmel AVR User Manual

64. IN - Load an I/O Location to Register
64.1. Description
Loads data from the I/O Space (Ports, Timers, Configuration Registers, etc.) into register Rd in the
Register File.
Operation:
(i) Rd ← I/O(A)
Syntax: Operands: Program Counter:
(i) IN Rd,A 0 ≤ d ≤ 31, 0 ≤ A ≤ 63 PC ← PC + 1
16-bit Opcode:
1011 0AAd dddd AAAA
64.2. Status Register (SREG) and Boolean Formula
I T H S V N Z C
– – – – – – – –
Example:
in r25,$16 ; Read Port B
cpi r25,4 ; Compare read value to constant
breq exit ; Branch if r25=4
...
exit: nop ; Branch destination (do nothing)
Words 1 (2 bytes)
Cycles 1
Atmel AVR Instruction Set Manual [OTHER]
Atmel-0856L-AVR-Instruction-Set-Manual_Other-11/2016
100

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