EasyManuals Logo

Atmel AVR User Manual

Atmel AVR
191 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #71 background imageLoading...
Page #71 background image
43. CLR – Clear Register
43.1. Description
Clears a register. This instruction performs an Exclusive OR between a register and itself. This will clear
all bits in the register.
Operation:
(i) Rd ← Rd Rd
Syntax: Operands: Program Counter:
(i) CLR Rd 0 ≤ d ≤ 31 PC ← PC + 1
16-bit Opcode: (see EOR Rd,Rd)
0010 01dd dddd dddd
43.2. Status Register (SREG) and Boolean Formula
I T H S V N Z C
0 0 0 1
S 0
Cleared.
V 0
Cleared.
N 0
Cleared.
Z 1
Set.
R (Result) equals Rd after the operation.
Example:
clr r18 ; clear r18
loop: inc r18 ; increase r18
...
cpi r18,$50 ; Compare r18 to $50
brne loop
Words 1 (2 bytes)
Cycles 1
Atmel AVR Instruction Set Manual [OTHER]
Atmel-0856L-AVR-Instruction-Set-Manual_Other-11/2016
71

Table of Contents

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Atmel AVR and is the answer not in the manual?

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

Related product manuals