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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 289頁

  • NEC   NEC

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CHAPTER 10
DATA BUFFER (DBF)
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)
Data buffer
DBF3
Don't care
DBF2
Don't care
DBF1
b
7
b
6
b
5
b
4
b
3
DBF0
b
2
b
1
PUT
b
0
Data in peripheral
hardware
b
7
Effective bits
b
0
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)
DBF3
Retained
DBF2
Retained
DBF1
b
7
b
6
b
5
b
4
b
3
DBF0
b
2
b
1
GET
Data in peripheral
hardware
b
7
Data buffer
b
0
Effective bits
b
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.
82

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