DS80C390_00 Datasheet, PDF (70/155 Pages) Dallas Semiconductor – High-Speed Microcontroller User’s Guide Supplement

MAS4-0
Bits 4-0
DS80C390 High-Speed Microcontroller User’s Guide Supplement
Multiplier Register Shift Bits. These bits determine the number of shifts
performed when a shift operation is performed with the arithmetic accelerator,
and are also used to indicate how many shifts were performed during a previous
normalization operation. These bits are cleared to 00000b following a system
reset or the initialization of the arithmetic accelerator.
When these bits are cleared to 00000b after loading the arithmetic accelerator, the
device will normalize the 32-bit value loaded into the arithmetic accelerator
Accumulator, rather than shifting it. Following the normalization operation, the
MAS4-0 bits will be modified to indicate how many shifts were performed.
Number of shifts of Arithmetic
MAS4 MAS3 MAS2 MAS1 MAS0 Accelerator Accumulator
0
0
0
0
0
Normalization
0
0
0
0
1
Shift by 1
0
0
0
1
0
Shift by 2
0
0
0
1
1
Shift by 3
.
.
.
.
.
.
.
.
.
.
.
.
1
1
1
1
0
Shift by 30
1
1
1
1
1
Shift by 31
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