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HP 27l30A
Table 3- 5. SIO Register Functions
WRITEREGISTER$
FUNCTION
WRO
Contains register pOinters, CRC initialization
information, initialization conmands for
operating mode9
WR1
Transmit/receive interrupt and data transfer
mode definition
WR2
Interrupt vector {channel B only>
WR3
Receive parameters and controls
WR4
. Transmit/receive miscellaneous parameters and
modes
WR5
Transmit parameters and controls
WR6
Synchronization character or SDLC address
field
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>
3-12
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