W77L532A Datasheet, PDF (32/88 Pages) List of Unclassifed Manufacturers – 8-BIT MICROCONTROLLER

W77L532A
7. INSTRUCTION
The W77L532 executes all the instructions of the standard 8032 family. The operation of these
instructions, their effect on the flag bits and the status bits is exactly the same. However, timing of these
instructions is different. The reason for this is two fold. Firstly, in the W77L532, each machine cycle
consists of 4 clock periods, while in the standard 8032 it consists of 12 clock periods. Also, in the
W77L532 there is only one fetch per machine cycle i.e. 4 clocks per fetch, while in the standard 8032
there can be two fetches per machine cycle, which works out to 6 clocks per fetch.
The advantage the W77L532 has is that since there is only one fetch per machine cycle, the number of
machine cycles in most cases is equal to the number of operands that the instruction has. In case of
jumps and calls there will be an additional cycle that will be needed to calculate the new address. But
overall the W77L532 reduces the number of dummy fetches and wasted cycles, thereby improving
efficiency as compared to the standard 8032.
Table 2. Instructions that affect Flag settings
INSTRUCTION
CARRY
OVERFLOW
AUXILIARY
CARRY
INSTRUCTION
ADD
X
X
X
CLR C
ADDC
X
X
X
CPL C
SUBB
X
X
X
ANL C, bit
MUL
0
X
ANL C, bit
DIV
0
X
ORL C, bit
DA A
X
ORL C, bit
RRC A
X
MOV C, bit
RLC A
X
CJNE
SETB C
1
A "X" indicates that the modification is as per the result of instruction.
CARRY
OVERFLOW
AUXILIARY
CARRY
0
X
X
X
X
X
X
X
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