83C166 Siemens Semiconductor Group, 83C166 Datasheet - Page 12

• Manufacturer Part Number: 83C166
• Description: 16-Bit CMOS Single-Chip Microcontroller
• Manufacturer: Siemens Semiconductor Group

SAB 80C166/83C166
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.
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