HMS91C8032 datasheet(13/157 Pages) HYNIX

13 / 157 page

HMS91C8032/97C8032

NOV., 2001 Ver 1.02

Oddly enough, DIV AB finds less use in arithmetic "divide" rou-

tines than in radix conversions and programmable shift opera-

tions. An example of the use of DIV AB in a radix conversion will

be given later. In shift operations, dividing a number by 2n shifts

its n bits to the right. Using DIV AB to perform the division com-

pletes the shift in 4

µs and leaves the B register holding the bits

that were shifted out. The DA A instruction is for BCD arithmetic

operations. In BCD arithmetic, ADD and ADDC instructions

should always be followed by a DA A operation, to ensure that

the result is also in BCD. Note that DA A will not convert a bina-

ry number to BCD. The DA A operation produces a meaningful

result only as the second step in the addition of two BCD bytes.

3.4 Logical Instructions

Table 3-2 shows list of HMS9XC8032 logical instructions. The

instructions that perform Boolean operations (AND, OR, Exclu-

sive OR, NOT) on bytes perform the operation on a bit-by-bit ba-

sis. That is, if the Accumulator contains 00110101B and byte

contains 01010011B, then :

ANL

<byte>

will leave the Accumulator holding 00010001B.

The addressing modes that can be used to access the <byte> op-

erand are listed in Table 3-2.

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 that Boolean operations can be performed on any byte in the

internal Data Memory space without going through the Accumu-

lator. 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 Accu-

mulator 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 Accumula-

tor 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 ma-

nipulations. For example, if the Accumulator contains a binary

number which is known to be less than 100, it can be quickly con-

verted to BCD by the following code:

MNEMONIC

OPERATION

ADDRESSING MODES

Dir

Ind

Reg

Imm

ANL A,<byte>

A = A .AND. <byte>

ANL <byte>,A

<byte> = <byte> .AND. A

ANL <byte>,#data

<byte> = <byte> .AND. #data

ORL A,<byte>

A = A .OR. <byte>

ORL <byte>,A

<byte> = <byte> .OR. A

ORL <byte>,#data

<byte> = <byte> .OR. #data

XRL A,<byte>

A = A .XOR. <byte>

XRL <byte>,A

<byte> = <byte> .XOR. A

XRL <byte>,#data

<byte> = <byte> .XOR. #data

CRL A

A = 00H

Accumulator only

CPL A

A = .NOT. A

Accumulator only

RL A

Rotate ACC Left 1 bit

Accumulator only

RLC A

Rotate Left through Carry

Accumulator only

RR A

Rotate ACC Right 1 bit

Accumulator only

RRC A

Rotate Right through Carry

Accumulator only

SWAP A

Swap Nibbles in A

Accumulator only

Table 3-2 HMS9XC8032 Logical Instructions

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