Holtek BS83B24C Manual page 174

Set Data Memory
SET [m]
Description Each bit of the specified Data Memory is set to 1.
Operation [m] ← FFH
Affected flag(s) None
SET [m].i Set bit of Data Memory
Description Bit i of the specified Data Memory is set to 1.
Operation [m].i ← 1
Affected flag(s) None
SIZ [m] Skip if increment Data Memory is 0
Description The contents of the specified Data Memory are first incremented 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
SIZA [m] Skip if increment Data Memory is zero with result in ACC
Description The contents of the specified Data Memory are first incremented by 1. If the result is 0, the
following instruction is skipped. The result is stored in the Accumulator but the specified
Data Memory contents remain unchanged. 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 ACC ← [m] + 1
Skip if ACC=0
Affected flag(s) None
Skip if Data Memory is not 0
SNZ [m].i
Description If the specified Data Memory is not 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 0 the program proceeds with the following instruction.
Operation Skip if [m].i ≠ 0
Affected flag(s) None
SNZ [m] Skip if Data Memory is not 0
Description If the specified Data Memory is not 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 0 the program proceeds with the following instruction.
Operation Skip if [m]≠ 0
Affected flag(s) None
SUB A,[m] Subtract Data Memory from ACC
Description The specified Data Memory is subtracted from the contents of 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]
Affected flag(s) OV, Z, AC, C, SC, CZ
Rev. 1.00
BS83B24C/BS83C40C
1�4
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