ADE75 datasheet(82/148 Pages) AD

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ADE75xx/ADE71xx

Preliminary Technical Data

Rev. PrE | Page 82 of 148

ADD

A, source

Function: Adds the source to the Accumulator.

Status Flags Referenced by Instruction: None

Status Flags Affected:

Status

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 will be set if two positive

operands yield a negative result or two negative

operands yield a positive result.

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

ADDC A, source

Function: Adds the source and the Carry bit to the Accumulator

Status Flags Referenced by Instruction: Carry

Status Flags Affected:

Status

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 will be set if two positive

operands yield a negative result or two negative

operands yield a positive result.

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

SUBB

A, source

Function: Subtract the source byte and the carry (borrow) flag

from the Accumulator.

Status Flags Referenced by Instruction: Carry (Borrow)

Status Flags Affected:

Status

Flag

Description

Set if there is a borrow needed for of bit 7. Cleared

otherwise. Used to indicate an overflow if the

operands are unsigned.

Set if there is a borrow is needed for bit 6 or bit 7 but

not for both. Used to indicate an overflow for signed

subtraction. This flag will be set if a negative number

subtracted from a positive yields a negative result or it

a positive number subtracted from a negative number

yields a positive result.

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

MUL

Function: Multiplies the Accumulator by the B register. 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

Status Flags Referenced by Instruction: None

Status Flags Affected: None

Status

Flag

Description

Cleared

Set if the result is greater than 255. Cleared

otherwise.

DIV

Function: Divides the Accumulator by the B register. This

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

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

Status Flags Referenced by Instruction: None

Status Flags Affected:

Status

Flag

Description

Cleared

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

case the results of the division are undefined and the

OV flag is set.

Function: Adjusts the Accumulator to hold two four 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 bits 0-3 exceed 9, 0x06 is added to the accumulator to

correct the lower four bits. If the carry bit was set when the

instruction began, or if 0x06 was added to the accumulator in

the first step, 0x60 is added to the accumulator to correct the

higher four bits.

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