Atmel AVR User Manual

2.6. Data Indirect
Figure 2-6. Data Indirect Addressing
Operand address is the contents of the X-, Y-, or the Z-register. In AVR devices without SRAM, Data
Indirect Addressing is called Register Indirect Addressing. Register Indirect Addressing is a subset of
Data Indirect Addressing since the data space form 0 to 31 is the Register File.
2.7. Data Indirect with Pre-decrement
Figure 2-7. Data Indirect Addressing with Pre-decrement
The X,- Y-, or the Z-register is decremented before the operation. Operand address is the decremented
contents of the X-, Y-, or the Z-register.
Atmel AVR Instruction Set Manual [OTHER]
Atmel-0856L-AVR-Instruction-Set-Manual_Other-11/2016
17

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