ATPL00B datasheet(35/152 Pages) ATMEL

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Atmel ATPL00B [datasheet]

43028A-ATPL - 9/12

Table 4-8.

Boolean Instructions

MNEMONIC

OPERATION

EXECUTION TIME (mc)

ANL C,bit

C = C.AND.bit

ANL C,/bit

C = C.AND..NOT.bit

ORL C,bit

C = C.OR.bit

ORL C,/bit

C = C.OR..NOT.bit

MOV C,bit

C = bit

MOV bit,C

bit = C

CLR C

C = 0

CLR bit

bit = 0

SETB C

C = 1

SETB bit

bit = 1

CPL C

C = .NOT.C

CPL bit

bit = .NOT.bit

JC rel

Jump if C = 1

JNC rel

Jump if C = 0

JB bit,rel

Jump if bit = 1

JNB bit,rel

Jump if bit = 0

JBC bit,rel

Jump if bit = 1; CLR bit

Relative Offset

The destination address for these jumps is specified to the assembler by a label or by an actual address in Program

memory. However, the destination address assembles to a relative offset byte. This is a signed (two‟s complement)

offset byte which is added to the PC in two‟s complement arithmetic if the jump is executed. The range of the jump is

therefore

–128 to +127 Program Memory bytes relative to the first byte following the instruction.

4.4.7

Jump Instructions

Table 4-9

shows the list of unconditional jumps and the execution time associated.

The table lists SJMP, LJMP, and AJMP, which differ in the format of the destination address. JMP is a generic

mnemonic which can be used if the programmer does not care which way the jump is encoded.

The SJMP instruction encodes the destination address as a relative offset, as described above. The instruction is 2

bytes long, consisting of the opcode and the relative offset byte. The jump distance is limited to a range of

–128 to +127

bytes relative to the instruction following the SJMP.

The LJMP instruction encodes the destination address as a 16-bit constant. The instruction is 3 bytes long, consisting of

the opcode and two address bytes. The destination address can be anywhere in the 64k Program Memory space.

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