Holtek HT827A0 Manual page 35

CPLA [m] Complement data memory place result in the 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
¾
DAA [m] Decimal-Adjust accumulator for addition
Description The value of the accumulator is adjusted to a BCD (Binary Code Decimal)
code. If bits 0~3 of the accumulator are greater than 9 or AC is one, six is
added to the low-order nibble of the accumulator, deriving a BCD digit in the
low-order nibble. Similarly, if bits 4~7 of the accumulator are greater than
nine or C is one, six is added to the high-order nibble of the accumulator, gen-
erating a BCD digit in the high-order nibble. The result is stored in the data
memory.
Operation If ACC.3~ACC.0 >9 or AC=1
then ([m].3~[m].0) ¬ (ACC.3~ACC.0)+6
else ([m].3~[m].0) ¬ (ACC.3~ACC.0)
and
If ACC.7~ACC.4 >9 or C=1
then ([m].7~[m].4) ¬ (ACC.7~ACC.4)+6,C=1
else ([m].7~[m].4) ¬ (ACC.7~ACC.4),C=C
Affected flag(s)
TC2
¾
DEC [m] Decrement data memory
Description Data in the specified data memory are decremented by one.
Operation
[m] ¬ [m]-1
Affected flag(s)
TC2
¾
TC1 TO PD OV
¾ ¾ ¾ ¾
TC1 TO PD OV
¾ ¾ ¾ ¾
TC1 TO PD OV
¾ ¾ ¾ ¾
35
HT827A0
Z AC C
Ö ¾ ¾
Z AC C
¾ ¾ Ö
Z AC C
Ö ¾ ¾
March 15, 2000