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HP 27130B
Table 3 - 5. SIO Register Functions
WRITE REGISTERS
FUNCTION
---
-.~~
WRO
Contains register pOinters, CRC initialization
information, initialization comma.nds for
operating modes
WR1
Transmit/receive interrupt and data transfer
mode definition
WR2
Interrupt vector (channel B only>
I
WR3
I
Receive parameters and controls
..
I
WR4
I
Transmit/receive mi scellaneous parameters and
modes
I
WRS
I
Transmit parameters and controls
I
WR6
Synchronization character or SDLC address
field
I
WR7
Synchronization character or SDLC flag
READ REGISTERS
FUNCTION
RRO
Transmit/recieve buffer status, interrupt
status, and external status
RR1
Special receive condition status
RR2
Modified interrupt vector (channel B only>
3-13
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