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UPD17015 Datasheet(PDF) 32 Page - NEC

Part # UPD17015
Description  4-BIT SINGLE-CHIP MICROCONTROLLER FOR PORTABLE RADIOS
PDF  120 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD17015 Datasheet(HTML) 32 Page - NEC

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µPD17015
8. DATA BUFFER (DBF)
8.1
OVERVIEW
Fig. 8-1 shows an overview of the data buffer.
The data buffer is configured in data memory and used to transfer data to and from peripheral hardware.
Fig. 8-1 Overview of the Data Buffer
Data buffer
Peripheral hardware
Reading data
(GET instruction)
Writing data
(PUT instruction)
Fig. 8-2 shows the configuration of the data buffer.
As shown in Fig. 8-2, the data buffer consists of 16 bits of addresses 0CH to 0FH in data memory.
The most significant bit (MSB) of the 16-bit data is bit b3 at address 0CH. The least significant bit (LSB) is bit b0
at address 0FH.
The data buffer is configured in data memory and can thus be manipulated by any data memory manipulation
instruction.



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