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UPD780204 Datasheet(PDF) 68 Page - NEC |
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UPD780204 Datasheet(HTML) 68 Page - NEC |
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68 / 418 page  CHAPTER 3 CPU ARCHITECTURE 68 User’s Manual U11302EJ4V0UM 3.3 Instruction Address Addressing An instruction address is determined by program counter (PC) contents. The PC contents are normally incremented (+1 for each byte) automatically according to the number of bytes of the instruction to be fetched each time another instruction is executed. When a branch instruction is executed, the branch destination information is set to the PC and the program is branched by the following addressing (for details of instructions, refer to the 78K/0 Series Instructions User’s Manual (U12326E)). 3.3.1 Relative addressing [Function] The value obtained by adding 8-bit immediate data (displacement value: jdisp8) of an instruction code to the start address of the following instruction is transferred to the program counter (PC) and branched. The displacement value is treated as signed two’s complement data (–128 to +127) and bit 7 becomes a sign bit. In other words, the range of branch in relative addressing is between –128 and +127 of the start address of the following instruction. This function is carried out when the BR $addr16 instruction or a conditional branch instruction is executed. [Illustration] 15 0 PC + 15 0 876 S 15 0 PC α jdisp8 When S = 0, all bits of α are 0. When S = 1, all bits of α are 1. PC indicates the start address of the instruction after the BR instruction. ... |
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