UPSD325X datasheet(22/176 Pages) STMICROELECTRONICS

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µPSD325X DEVICES

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Table 4. Arithmetic Instructions

Logical Instructions

Table 5, page 23 shows list of µPSD325X devices

logical instructions. The instructions that perform

Boolean operations (AND, OR, Exclusive OR,

NOT) on bytes perform the operation on a bit-by-

bit basis. That is, if the Accumulator contains

00110101B and byte contains 01010011B, then:

ANL A, <byte>

will leave the Accumulator holding 00010001B.

The addressing modes that can be used to access

the <byte> operand are listed in Table 5.

The ANL A, <byte> instruction may take any of the

forms:

ANL A,7FH(direct addressing)

ANL A, @R1 (indirect addressing)

ANL A,R6 (register addressing)

ANL A,#53H (immediate constant)

Note: Boolean operations can be performed on

any byte in the internal Data Memory space with-

out going through the Accumulator. The XRL

<byte>, #data instruction, for example, offers a

quick and easy way to invert port bits, as in

XRL P1, #0FFH.

If the operation is in response to an interrupt, not

using the Accumulator saves the time and effort to

push it onto the stack in the service routine.

The Rotate instructions (RL A, RLC A, etc.) shift

the Accumulator 1 bit to the left or right. For a left

rotation, the MSB rolls into the LSB position. For a

right rotation, the LSB rolls into the MSB position.

The SWAP A instruction interchanges the high

and low nibbles within the Accumulator. This is a

useful operation in BCD manipulations. For exam-

ple, if the Accumulator contains a binary number

which is known to be less than 100, it can be quick-

ly converted to BCD by the following code:

MOVE B,#10

DIV AB

SWAP A

ADD A,B

Dividing the number by 10 leaves the tens digit in

the low nibble of the Accumulator, and the ones

digit in the B register. The SWAP and ADD instruc-

tions move the tens digit to the high nibble of the

Accumulator, and the ones digit to the low nibble.

Mnemonic

Operation

Addressing Modes

Dir.

Ind.

Reg.

Imm

ADD A,<byte>

A = A + <byte>

XXXX

ADDC A,<byte>

A = A + <byte> + C

XXXX

SUBB A,<byte>

A = A – <byte> – C

XXXX

INC

A = A + 1

Accumulator only

INC <byte>

<byte> = <byte> + 1

INC DPTR

DPTR = DPTR + 1

Data Pointer only

DEC

A = A – 1

Accumulator only

DEC <byte>

<byte> = <byte> – 1

MUL AB

B:A = B x A

Accumulator and B only

DIV AB

A = Int[ A / B ]

B = Mod[ A / B ]

Accumulator and B only

DA A

Decimal Adjust

Accumulator only

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