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Download ST7 8-bit MCU family user guide
Transcript
4 - Architecture of the ST7 core ■ The last mode, called inherent, means that the data involved in the instruction does not need to be designated by an address, such as the instruction that increments the accumulator. The many indexed and indirect modes available are useful for translating programs written in C language, since these programs frequently use complex data structures. 4.3.3 Instruction set The instruction set of the ST7 includes many instructions. They can be sorted in different ways. Here is a grouping by number of addressing modes available. This kind of sorting may seem arbitrary, but there are actually groups of instructions that have a common function and also the same set of addressing modes. Table 2. Table of the number of addressing modes versus the instruction types. Type of instruction No operand (system) Multiplication and branch (relative) 2 1 (inherent) Push and pop Load memory with index 4 9 Load and compare index Single operand arithmetic and test Load memory with accumulat or and jump long Twooperand arithmetic 10 11 14 15 CLR HALT CPL IRET DEC NOP MUL INC RCF BRES NEG RET BSET RIM BTJF RSP BTJT SCF CALLR SIM JR* POP PUSH LD mem, X CP X, LD mem, Y CP Y, LD X, LD Y, RLC RRC SLA SLL SRA TRAP SRL WFI SWAP ADC ADD AND CALL BCP JP CP A, LD mem, A LD A, OR SBC SUB XOR TNZ 73/315
