HT48CA0 datasheet(25/36 Pages) HOLTEK

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CPLA [m]

Complement data memory and place result in accumulator

Description

Each bit of the specified data memory is logically complemented (1’s comple-

ment). Bits which previously contained a one are changed to zero and

vice-versa. The complemented result is stored in the accumulator and the

contents of the data memory remain unchanged.

Operation

ACC

← [m]

Affected flag(s)

TC2

TC1

–––

–

√

––

DAA [m]

Decimal-Adjust accumulator for addition

Description

The accumulator value is adjusted to the BCD (Binary Code Decimal) code.

The accumulator is divided into two nibbles. Each nibble is adjusted to BCD

code and an internal carry (AC1) will be created if the low nibble of the

accumulator is greater than 9. The BCD adjustment is done by adding 6 to

the original value if the original value is greater than 9 or a carry (AC or C)

is set; otherwise the original value remains unchanged. The result is stored

in the data memory and only the carry flag (C) may be affected.

Operation

If (ACC.3~ACC.0) >9 or AC=1

then ([m].3~[m].0)

← (ACC.3~ACC.0)+6, AC1=AC

else ([m].3~[m].0)

← (ACC.3~ACC.0), AC1=0

If (ACC.7~ACC.4)+AC1 >9 or C=1

then ([m].7~[m].4)

← (ACC.7~ACC.4)+6+AC1, C=1

else ([m].7~[m].4)

← (ACC.7~ACC.4)+AC1, C=C

Affected flag(s)

TC2

TC1

–––

–

√

DEC [m]

Decrement data memory

Description

Data in the specified data memory is decremented by one

Operation

[m]

← [m]–1

Affected flag(s)

TC2

TC1

–––

–

√

––

HT48CA0

23rd July ’98

HT48CA0 Scheda tecnica(PDF) 25 Page - Holtek Semiconductor Inc

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