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UPD17P136ACT Datasheet(PDF) 99 Page - NEC |
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UPD17P136ACT Datasheet(HTML) 99 Page - NEC |
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99 / 292 page  CHAPTER 10 DATA BUFFER (DBF) 80 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 execution time for a single PUT or GET instruction is the same regardless of whether 8 or 16 bits are being transferred. Example 1. PUT instruction (when the actual bits in peripheral hardware are the 8 bits from 0 to 7) When only 8 bits of data are being written from the data buffer, the high-order 8 bits (DBF3, DBF2) are “don’t care” (any value can be written). 2. GET instruction (when the actual bits in peripheral hardware are the 8 bits from 0 to 7) When 8 bits of data are being read into the data buffer, the values in the high-order 8 bits (DBF3, DBF2) remain unchanged. b3 b2 b1 b0 b6 b5 b4 b7 DBF3 DBF2 DBF1 DBF0 Don’t care Don’t care b0 b7 Actual bits Data in peripheral hardware PUT Data buffer b0 b7 DBF3 DBF2 DBF1 DBF0 Retained Retained b0 b7 Actual bits Data in peripheral hardware GET Data buffer |
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