30
30
Table 7 - Status Register
BIT
BIT NAME
SYMBOL
DESCRIPTION
7
Receiver
Inhibited
RI
This bit, if high, indicates that the receiver is not enabled
because either an "Enable Receive to Page fnn" command
was never issued, or a packet has been deposited into the
RAM buffer page fnn as specified by the last "Enable Receive
to Page fnn" command. No messages will be received until
this command is issued, and once the message has been
received, the RI bit is set, thereby inhibiting the receiver. The
RI bit is cleared by issuing an "Enable Receive to Page fnn"
command. This bit, when set, will cause an interrupt if the
corresponding bit of the Interrupt Mask Register (IMR) is also
set. When this bit is set and another station attempts to send
a packet to this station, this station will send a NAK.
6,5
(Reserved)
These bits are undefined.
4
Power On Reset
POR
This bit, if high, indicates that the ARCNET core has been
reset by either a software reset, a hardware reset, or writing
00H to the Node ID Register. The POR bit is cleared by the
"Clear Flags" command.
3
Test
TEST
This bit is intended for test and diagnostic purposes. It is a
logic "0" under normal operating conditions.
2
Reconfiguration
RECON
This bit, if high, indicates that the Line Idle Timer has timed
out because the RXIN pin was idle for 82 S. The RECON bit
is cleared during a "Clear Flags" command. This bit, when
set, will cause an interrupt if the corresponding bit in the IMR
is also set. The interrupt service routine should consist of
examing the MYRECON bit of the Diagnostic Status Register
to determine whether there are consecutive reconfigurations
caused by this node.
1
Transmitter
Message
Acknowledged
TMA
This bit, if high, indicates that the packet transmitted as a
result of an "Enable Transmit from Page fnn" command has
been acknowledged. This bit should only be considered valid
after the TA bit (bit 0) is set. Broadcast messages are never
acknowledged. The TMA bit is cleared by issuing the "Enable
Transmit from Page fnn" command.
0
Transmitter
Available
TA
This bit, if high, indicates that the transmitter is available for
transmitting. This bit is set when the last byte of scheduled
packet has been transmitted out, or upon execution of a
"Disable Transmitter" command. The TA bit is cleared by
issuing the "Enable Transmit from Page fnn" command after
the node next receives the token. This bit, when set, will
cause an interrupt if the corresponding bit in the IMR is also
set.
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