Holtek HT68F Series Manual page 254

RRA [m] Rotate Data Memory right with result in ACC
Description Data in the specified Data Memory and the carry flag are rotated right by 1 bit with bit 0
rotated into bit 7. The rotated result is stored in the Accumulator and the contents of the
Data Memory remain unchanged.
Operation ACC.i ← [m].(i+1); (i=0~6)
ACC.7 ← [m].0
Affected flag(s) None
RRC [m] Rotate Data Memory right through Carry
Description The contents of the specified Data Memory and the carry flag are rotated right by 1 bit. Bit 0
replaces the Carry bit and the original carry flag is rotated into bit 7.
Operation [m].i ← [m].(i+1); (i=0~6)
[m].7 ← C
C ← [m].0
Affected flag(s) C
RRCA [m] Rotate Data Memory right through Carry with result in ACC
Description Data in the specified Data Memory and the carry flag are rotated right by 1 bit. Bit 0 replaces
the Carry bit and the original carry flag is rotated into bit 7. The rotated result is stored in the
Accumulator and the contents of the Data Memory remain unchanged.
Operation ACC.i ← [m].(i+1); (i=0~6)
ACC.7 ← C
C ← [m].0
Affected flag(s) C
Subtract Data Memory from ACC with Carry
SBC A,[m]
Description The contents of the specified Data Memory and the complement of the carry flag are
subtracted from the Accumulator. The result is stored in the Accumulator. Note that if the
result of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is
positive or zero, the C flag will be set to 1.
Operation ACC ← ACC − [m] − C
Affected flag(s) OV, Z, AC, C
SBCM A,[m] Subtract Data Memory from ACC with Carry and result in Data Memory
Description The contents of the specified Data Memory and the complement of the carry flag are
subtracted from the Accumulator. The result is stored in the Data Memory. Note that if the
result of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is
positive or zero, the C flag will be set to 1.
Operation [m] ← ACC − [m] − C
Affected flag(s) OV, Z, AC, C
SDZ [m] Skip if decrement Data Memory is 0
Description The contents of the specified Data Memory are first decremented by 1. If the result is 0 the
following instruction is skipped. As this requires the insertion of a dummy instruction while
the next instruction is fetched, it is a two cycle instruction. If the result is not 0 the program
proceeds with the following instruction.
Operation [m] ← [m] − 1
Skip if [m]=0
Affected flag(s) None
Rev. 2.10
HT68F20/HT68F30/HT68F40/HT68F50/HT68F60
HT68FU30/HT68FU40/HT68FU50/HT68FU60
Enhanced I/O Flash Type 8-Bit MCU with EEPROM
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