Peripheral Simulation

For Cadence Design Systems Inc. R8051XC2-B (1 DPTR) — Arithmetic Unit

Simulation support for this peripheral or feature is comprised of:

• Dialog boxes which display and allow you to change peripheral configuration.

These simulation capabilities are described below.

Arithmetic Unit Dialog

The Arithmetic Unit performs high-speed multiply, divide, bit shift and normalize operations using an integrated MDU in the processor core.

Arithmetic Unit Group

• ARCON (Control Register) contains the following control bits:
• SC (Shift Count) contains the number of shifts the MDU is to perform. SC is set to zero to perform floating-point normalization on the value in MD0-MD3.
• SLR (Shift Direction Bit) is set for right shift operation and reset for left shift operations.
• MDOV (Overflow Flag) is set if the result from a multiply is greater than 0xFFFF, or if division by zero, or if MD3.7 is set at the start of normalization.
• MDEF (Error Flag) is set if an arithmetic operation was interrupted by a new arithmetic operation. The register values are not valid when this condition occurs.
• Operation displays the type of operation performed by the MDU. The order in which the MD0-MD5 registers are written and read determines the operation type.
• MD0-MD5 (MDU Data Registers 0-5) holds the operand values for the requested arithmetic function and the resulting values after performing the requested function.