Shift the accumlator or address 1 bit left

Bit 0 is always 0 and bit 7 pre-shift enters the carry flag.

Operation

C <- M7...M0 <- 0

Table

ASL Shift Left One Bit (Memory or Accumulator)

C <- [76543210] <- 0 N Z C I D V

                                + + + - - -

addressing assembler opc bytes cyles

accumulator ASL A 0A 1 2 zeropage ASL oper 06 2 5 zeropage,X ASL oper,X 16 2 6 absolute ASL oper 0E 3 6 absolute,X ASL oper,X 1E 3 7

Flags

• Carry: 1 if bit 7 was 1; 0 if bit 7 was 0
• Zero: 1 if accumulator is zero; 0 otherwise
• Negative: 1 if bit 7 of accumulator is set; 0 otherwise