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UPD17P136ACT Datasheet(PDF) 45 Page - NEC |
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UPD17P136ACT Datasheet(HTML) 45 Page - NEC |
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45 / 292 page  CHAPTER 4 PROGRAM MEMORY (ROM) 26 <1> Direct subroutine call When using a direct subroutine call (CALL addr), the 11-bit instruction operand is used to specify a program memory address of the branched subroutine. (In the case of the µPD17134A and µPD17135A, the most significant bit must be 0. If an address is specified outside of this range, an error will occur in the assembler.) Example Figure 4-2. CALL addr Instruction Note The program memory of the µPD17134A and µPD17135A is address 0000H to 03FFH. <2> Indirect subroutine call When using an indirect subroutine call (CALL @AR), the value in the address register (AR) should be an address of the called subroutine. This instruction can be used to branch any address in program memory. Also see 7.2 ADDRESS REGISTER (AR). Address 0000H Program memory 07FFH Note CALL SUB1 RET SUB1; |
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