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UPD17P136ACT bảng dữ liệu(PDF) 99 Page - NEC

tên linh kiện UPD17P136ACT
Giải thích chi tiết về linh kiện  4-BIT SINGLE-CHIP MICROCONTROLLER
PDF  292 Pages
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nhà sản xuất  NEC [NEC]
Trang chủ  http://www.nec.com/
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UPD17P136ACT bảng dữ liệu(HTML) 99 Page - NEC

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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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