SAFC161RI datasheet(15/60 Pages) SIEMENS

15 / 60 page

Semiconductor Group

1998-05-01

C161RI

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

a register bank may overlap others.

A system stack of up to 1024 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)

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 C161RI 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.

SAFC161RI Datasheet(PDF) 15 Page - Siemens Semiconductor Group