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ST72344S2 Datasheet(PDF) 195 Page - STMicroelectronics |
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ST72344S2 Datasheet(HTML) 195 Page - STMicroelectronics |
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195 / 247 page  ST72344xx, ST2345xx Instruction set Doc ID 12321 Rev 6 195/247 12.2 Instruction groups The ST7 family devices use an instruction set consisting of 63 instructions. The instructions may be subdivided into 13 main groups as illustrated in the following table: Using a prebyte The instructions are described with 1 to 4 bytes. In order to extend the number of available opcodes for an 8-bit CPU (256 opcodes), three different prebyte opcodes are defined. These prebytes modify the meaning of the instruction they precede. The whole instruction becomes: ● PC-2 End of previous instruction ● PC-1 Prebyte ● PC Opcode ● PC+1 Additional word (0 to 2) according to the number of bytes required to compute the effective address These prebytes enable instruction in Y as well as indirect addressing modes to be implemented. They precede the opcode of the instruction in X or the instruction using direct addressing mode. The prebytes are: Table 82. Main instruction groups Load and Transfer LD CLR Stack operation PUSH POP RSP Increment/Decrement INC DEC Compare and Tests CP TNZ BCP Logical operations AND OR XOR CPL NEG Bit Operation BSET BRES Conditional Bit Test and Branch BTJT BTJF Arithmetic operations ADC ADD SUB SBC MUL Shift and Rotates SLL SRL SRA RLC RRC SWAP SLA Unconditional Jump or Call JRA JRT JRF JP CALL CALLR NOP RET Conditional Branch JRxx Interruption management TRAP WFI HALT IRET Condition Code Flag modification SIM RIM SCF RCF PDY 90 Replace an X-based instruction using immediate, direct, indexed, or inherent addressing mode by a Y one. PIX 92 Replace an instruction using direct, direct bit or direct relative addressing mode to an instruction using the corresponding indirect addressing mode. It also changes an instruction using X indexed addressing mode to an instruction using indirect X indexed addressing mode. PIY 91 Replace an instruction using X indirect indexed addressing mode by a Y one. |
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