SAB80C517A-N18 Siemens Semiconductor Group, SAB80C517A-N18 Datasheet - Page 48

• Manufacturer Part Number: SAB80C517A-N18
• 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 operation.
Operation
32-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:
Operation of the MDU
To start an operation, register MD0 to MD5 (or ARCON) must be written to in a certain se-
quence 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.
*
16-bit
Result
32-bit
16-bit
32-bit
–
–
47
Remainder
16-bit
16-bit
–
–
–
SAB 80C517A/83C517A-5
Execution Time
6 t
4 t
4 t
6 t
6 t
cy
cy
cy
cy
cy
1)
2)
2)
1994-05-01