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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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UPD17P133CS Scheda tecnica(PDF) 97 Page - NEC |
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UPD17P133CS Scheda tecnica(HTML) 97 Page - NEC |
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97 / 289 page  CHAPTER 10 DATA BUFFER (DBF) 82 10.2.2 Data Transfer with Peripheral Hardware Data can be transferred between the data buffer and peripheral hardware in 8- or 16-bit units. Instruction cycle for a single PUT or GET instruction is the same regardless of whether eight or sixteen bits are being transferred. Example 1. PUT instruction (when the effective bits in peripheral hardware are the 8 bits from 7 to 0) DBF0 b0 b1 b2 b3 Data in peripheral hardware b4 b5 b6 b7 DBF2 Don't care DBF3 Don't care b0 Effective bits b7 PUT DBF1 Data buffer When only eight bits of data are being written from the data buffer, the upper eight bits of the data buffer (DBF3, DBF2) are irrelevant. Example 2. GET instruction (when the effective bits in peripheral hardware are the 8 bits from 7 to 0) When only eight bits of data are being read into the data buffer, the values in the upper eight bits of the data buffer (DBF3, DBF2) remain unchanged. DBF0 b0 b1 b2 b3 Data in peripheral hardware b4 b5 b6 b7 DBF2 Retained DBF3 Retained b0 Effective bits b7 GET DBF1 Data buffer |
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