37. CBI – Clear Bit in I/O Register
37.1. Description
Clears a specified bit in an I/O register. This instruction operates on the lower 32 I/O registers –
addresses 0-31.
Operation:
(i) I/O(A,b) ← 0
Syntax: Operands: Program Counter:
(i) CBI A,b 0 ≤ A ≤ 31, 0 ≤ b ≤ 7 PC ← PC + 1
16-bit Opcode:
1001 1000 AAAA Abbb
37.2. Status Register (SREG) and Boolean Formula
I T H S V N Z C
– – – – – – – –
Example:
cbi $12,7 ; Clear bit 7 in Port D
Words 1 (2 bytes)
Cycles 2
Cycles XMEGA 1
Cycles Reduced Core tinyAVR 1
Atmel AVR Instruction Set Manual [OTHER]
Atmel-0856L-AVR-Instruction-Set-Manual_Other-11/2016
65
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