ADE5166 datasheet(89/156 Pages) AD

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ADE5166/ADE5169/ADE5566/ADE5569

Rev. B | Page 89 of 156

INSTRUCTIONS THAT AFFECT FLAGS

Many instructions explicitly modify the carry bit, such as the

MOV C bit and CLR C instructions. Other instructions that

affect status flags are listed in this section.

ADD A, Source

This instruction adds the source to the accumulator. No status

flags are referenced by the instruction.

Table 70. ADD A (Source) Affected Status Flags

Flag

Description

Set if there is a carry out of Bit 7. Cleared otherwise. Used

to indicate an overflow if the operands are unsigned.

Set if there is a carry out of Bit 6 or a carry out of Bit 7, but

not if both are set. Used to indicate an overflow for

signed addition. This flag is set if two positive operands

yield a negative result or if two negative operands yield a

positive result.

Set if there is a carry out of Bit 3. Cleared otherwise.

ADDC A, Source

This instruction adds the source and the carry bit to the accu-

mulator. The carry status flag is referenced by the instruction.

Table 71. ADDC A (Source) Affected Status Flags

Flag

Description

Set if there is a carry out of Bit 7. Cleared otherwise. Used

to indicate an overflow if the operands are unsigned.

Set if there is a carry out of Bit 6 or a carry out of Bit 7, but

not if both are set. Used to indicate an overflow for

signed addition. This flag is set if two positive operands

yield a negative result or if two negative operands yield a

positive result.

Set if there is a carry out of Bit 3. Cleared otherwise.

SUBB A, Source

This instruction subtracts the source byte and the carry (borrow)

flag from the accumulator. It references the carry (borrow)

status flag.

Table 72. SUBB A (Source) Affected Status Flags

Flag

Description

Set if there is a borrow needed for Bit 7. Cleared other-

wise. Used to indicate an overflow if the operands are

unsigned.

Set if there is a borrow needed for Bit 6 or Bit 7, but not

for both. Used to indicate an overflow for signed sub-

traction. This flag is set if a negative number subtracted

from a positive number yields a negative result or if a

positive number subtracted from a negative number

yields a positive result.

Set if a borrow is needed for Bit 3. Cleared otherwise.

MUL AB

This instruction multiplies the accumulator by the B SFR. This

operation is unsigned. The lower byte of the 16-bit product is

stored in the accumulator and the higher byte is left in the B

Table 73. MUL AB Affected Status Flags

Flag

Description

Cleared.

Set if the result is greater than 255. Cleared otherwise.

DIV AB

This instruction divides the accumulator by the B SFR. This

operation is unsigned. The integer part of the quotient is stored

in the accumulator and the remainder goes into the B register.

No status flags are referenced by the instruction.

Table 74. DIV AB Affected Status Flags

Flag

Description

Cleared.

Cleared unless the B register is equal to 0, in which

case the results of the division are undefined and the

OV flag is set.

DA A

This instruction adjusts the accumulator to hold two 4-bit digits

after the addition of two binary coded decimals (BCDs) with the

ADD or ADDC instructions. If the AC bit is set or if the value of

Bit 0 to Bit 3 exceeds 9, 0x06 is added to the accumulator to cor-

rect the lower four bits. If the carry bit is set when the instruction

begins, or if 0x06 is added to the accumulator in the first step, 0x60

is added to the accumulator to correct the higher four bits.

The carry and AC status flags are referenced by this instruction.

Table 75. DA A Affected Status Flag

Flag

Description

Set if the result is greater than 0x99. Cleared otherwise.

RRC A

This instruction rotates the accumulator to the right through

the carry flag. The old LSB of the accumulator becomes the new

carry flag, and the old carry flag is loaded into the new MSB of

the accumulator.

The carry status flag is referenced by this instruction.

Table 76. RRC A Affected Status Flag

Flag

Description

Equal to the state of ACC[0] before execution of the

instruction.

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