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Section Five
Receive Buffer Register
Offset from Base I/O Address = 0
Register Address = XF8
DLAB bit in Line Control Register = 0
7
6
D7
D6
The Receive Buffer Register contains the character received from the serial input, with bit 0 being
the least significant and bit 7 the most significant. It functions identically on the GPIB-COM and
the INS8250.
Bit
Mnemonic
7-0r
D[7-0]
© National Instruments Corporation
5
4
D5
D4
Description
Data Bits 7 through 0
5-3
3
2
D2
D3
Programming the GPIB-COM
1
0
R
D1
D0
GPIB-COM User Manual
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