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UPD17P136ACT Datasheet(PDF) 46 Page - NEC |
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UPD17P136ACT Datasheet(HTML) 46 Page - NEC |
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46 / 292 page  CHAPTER 4 PROGRAM MEMORY (ROM) 27 4.2.2 Table Reference Table reference is used to reference constant data in program memory. The table reference instruction (MOVT DBF, @AR) is used to store the contents of the program memory address specified by the address register in the data buffer. Since each location in program memory contains 16 bits of information, the MOVT instruction causes 16 bits of data to be stored in the data buffer. The address register can be used to table reference any location in program memory. Caution Note that one level of the address stack is temporarily used when performing table reference. Be sure not to exceed the stack level that can be used. Also see 7.2 ADDRESS REGISTER (AR) and CHAPTER 10 DATA BUFFER (DBF). Remark Two instruction cycles are required to execute the table reference instruction, but this is an exception. Figure 4-3. Table Reference (MOVT DBF, @AR) Note This bit is fixed to 0 in the case of the µPD17134A and µPD17135A. b15 b4 b5 b6 b7 b8 b9 b14 b13 b12 b11 b10 Constant data Program memory AR3 AR2 AR1 AR0 Address register 00000 16-bit data read Table address specification b0 b1 b2 b3 DBF3 Data buffer DBF2 DBF1 DBF0 Note b0 b1 b2 b3 b0 b1 b2 b3 b0 b1 b2 b3 b0 b1 b2 b3 b0 b1 b2 b3 b0 b1 b2 b3 b0 b1 b2 b3 b0 b1 b2 b3 |
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