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SAF-C161PI Datasheet(PDF) 22 Page - Infineon Technologies AG |
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SAF-C161PI Datasheet(HTML) 22 Page - Infineon Technologies AG |
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22 / 400 page  &3, $UFKLWHFWXUDO2YHUYLHZ User’s Manual 2-6 1999-08 Consistent and Optimized Instruction Formats To obtain optimum performance in a pipelined design, an instruction set has been designed which incorporates concepts from Reduced Instruction Set Computing (RISC). These concepts primarily allow fast decoding of the instructions and operands while reducing pipeline holds. These concepts, however, do not preclude the use of complex instructions, which are required by microcontroller users. The following goals were used to design the instruction set: 1. Provide powerful instructions to perform operations which currently require sequences of instructions and are frequently used. Avoid transfer into and out of temporary registers such as accumulators and carry bits. Perform tasks in parallel such as saving state upon entry into interrupt routines or subroutines. 2. Avoid complex encoding schemes by placing operands in consistent fields for each instruction. Also avoid complex addressing modes which are not frequently used. This decreases the instruction decode time while also simplifying the development of compilers and assemblers. 3. Provide most frequently used instructions with one-word instruction formats. All other instructions are placed into two-word formats. This allows all instructions to be placed on word boundaries, which alleviates the need for complex alignment hardware. It also has the benefit of increasing the range for relative branching instructions. The high performance offered by the hardware implementation of the CPU can efficiently be utilized by a programmer via the highly functional C161PI 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 Possible operand types are bits, bytes and words. Specific instruction support the conversion (extension) of bytes to words. A variety of direct, indirect or immediate addressing modes are provided to specify the required operands. |
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