SAB80C517-16-N-T40/85 Siemens Semiconductor Group, SAB80C517-16-N-T40/85 Datasheet - Page 35

• Manufacturer Part Number: SAB80C517-16-N-T40/85
• Description: 8-Bit CMOS Single-Chip Microcontroller
• Manufacturer: Siemens Semiconductor Group

Multiplication/Division Unit
This on-chip arithmetic unit provides fast 32-bit division, 16-bit multiplication as well as shift and
normalize features. All operations are integer operations.
Operation
32-bit/16-bit
16-bit/16-bit
16-bit 16-bit
32-bit normalize
32-bit shift left/right
1)
2)
The MDU consists of six registers used for operands and results and one control register.
Operation of the MDU can be divided in three phases:
Figure 10
Operation of the MDU
To start an operation, register MD0 to MD5 (or ARCON) must be written to in a certain
sequence according to table 5 or 6. The order the registers are accessed determines the type
of the operation. A shift operation is started by a final write operation to register ARCON (see
also the register description).
Semiconductor Group
1
The maximal shift speed is 6 shifts/cycle.
t
cy = 1 s @ 12 MHz oscillator frequency.
Result
32-bit
16-bit
32-bit
–
–
34
Remainder
16-bit
16-bit
–
–
–
SAB 80C517/80C537
Execution Time
6 t
4
4 t
6 t
6 t
t cy
cy
cy
cy
cy
1
2
2
)
)
)