83C166 datasheet(12/52 Pages) SIEMENS

12 / 52 page

SAB 80C166/83C166

Semiconductor Group

A system stack of up to 512 bytes is provided as a storage for temporary data. The system stack is

allocated in the on-chip RAM area, and it is accessed by the CPU via the stack pointer (SP) register.

Two separate SFRs, STKOV and STKUN, are implicitly compared against the stack pointer value

upon each stack access for the detection of a stack overflow or underflow.

The high performance offered by the hardware implementation of the CPU can efficiently be utilized

by a programmer via the highly efficient SAB 80C166 instruction set which includes the following

instruction classes:

– Arithmetic Instructions

– Logical Instructions

– Boolean Bit Manipulation Instructions

– Compare and Loop Control Instructions

– Shift and Rotate Instructions

– Prioritize Instruction

– Data Movement Instructions

– System Stack Instructions

– Jump and Call Instructions

– Return Instructions

– System Control Instructions

– Miscellaneous Instructions

The basic instruction length is either 2 or 4 bytes. Possible operand types are bits, bytes and words.

A variety of direct, indirect or immediate addressing modes are provided to specify the required

operands.

83C166 Datasheet(PDF) 12 Page - Siemens Semiconductor Group