Atmel AVR User Manual

11. BCLR – Bit Clear in SREG
11.1. Description
Clears a single Flag in SREG.
Operation:
(i) SREG(s) ← 0
Syntax: Operands: Program Counter:
(i) BCLR s 0 ≤ s ≤ 7 PC ← PC + 1
16-bit Opcode:
1001 0100 1sss 1000
11.2. Status Register (SREG) and Boolean Formula
I T H S V N Z C
⇔ ⇔ ⇔ ⇔ ⇔ ⇔ ⇔ ⇔
I 0 if s = 7; Unchanged otherwise.
T 0 if s = 6; Unchanged otherwise.
H 0 if s = 5; Unchanged otherwise.
S 0 if s = 4; Unchanged otherwise.
V 0 if s = 3; Unchanged otherwise.
N 0 if s = 2; Unchanged otherwise.
Z 0 if s = 1; Unchanged otherwise.
C 0 if s = 0; Unchanged otherwise.
Example:
bclr 0 ; Clear Carry Flag
bclr 7 ; Disable interrupts
Words 1 (2 bytes)
Cycles 1
Atmel AVR Instruction Set Manual [OTHER]
Atmel-0856L-AVR-Instruction-Set-Manual_Other-11/2016
38

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