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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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UPD17062 датащи(PDF) 93 Page - Renesas Technology Corp |
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UPD17062 датащи(HTML) 93 Page - Renesas Technology Corp |
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93 / 298 page  91 µPD17062 10.3 DATA BUFFER AND TABLE REFERENCING 10.3.1 Table Referencing Tables are referenced by reading the constant data from program memory into the data buffer. This is done using the MOVT DBF, @AR instruction. Therefore, if display data or other constant data is written to program memory in advance and a table reference instruction is executed, writing of a complex data conversion program is unnecessary. The MOVT instruction is described below. A example program is given in Section 10.3.2. MOVT DBF, @AR ; Reads the contents of the program memory addressed by the address register into the data buffer as shown below. When a table reference instruction is executed, the stack is used one level. Because the address register (AR) has only eight valid bits, program memory available for table reference is limited to 256 steps from address 0000H to address 00FFH. See also Chapter 4 and Section 8.1. 16 MOVT DBF, @ AR DBF3 DBF2 DBF1 DBF0 b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0 b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0 Constant data Data buffer Program memory (ROM) Specifies the program memory address |
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