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UPD17P133CS Datasheet(PDF) 97 Page - NEC

No. de pieza UPD17P133CS
Descripción Electrónicos  4-BIT SINGLE-CHIP MICROCONTROLLER
PDF  289 Pages
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Fabricante Electrónico  NEC [NEC]
Página de inicio  http://www.nec.com/
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UPD17P133CS Datasheet(HTML) 97 Page - NEC

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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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