Holtek HT48R05A-1, Handbook, Page: 68 / 125

SDZA [m] Skip if decrement Data Memory is zero with result in ACC
Description The contents of the specified Data Memory are first decremented 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 in-
struction 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
SET [m] Set Data Memory
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 in-
struction 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
Chapter 3 Instruction Definition
61