SAB-C161K-L16M SIEMENS [Siemens Semiconductor Group], SAB-C161K-L16M Datasheet - Page 13

• Manufacturer Part Number: SAB-C161K-L16M
• Description: 16-Bit CMOS Single-Chip Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

C161
1996 Intermediate Version
The CPU disposes of an actual register context consisting of up to 16 wordwide GPRs which are
physically allocated within the on-chip RAM area. A Context Pointer (CP) register determines the
base address of the active register bank to be accessed by the CPU at a time. The number of
register banks is only restricted by the available internal RAM space. For easy parameter passing,
a register bank may overlap others.
A system stack 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 C161 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.
Semiconductor Group
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