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OFFSET +0
OFFSET +2
OFFSET +4
15
14
13
12
E
B
H
E
B
H
E
B
H
OFFSET+ E
E
I
B
I
H
I
8 7
CHARACTER!
CHARACTER2
CHARACTER3
CHARACTERS
Figure 4-14. BISYNC Control Characters Table
0
E - End of Table
1 =The entry is not valid. No valid entries exist beyond this entry.
0 =This entry is valid. The lower eight bits will be checked against the
incoming character.
NOTE
In tables with eight control characters, E should be zero in all eight
positions.
B - BCS Expected
1 =The character is written into the receive buffer. The receiver waits for
one LRC or two CRC bytes of BCS and then closes the buffer. This
should be used for ETB, ETX, and ITB.
0 =The character is written into the receive buffer. The buffer is then
closed.
NOTE
A maskable interrupt is generated after the buffer is closed.
H - Enter Hunt Mode
MOTOROLA
1 =The Bl SYNC controller will enter hunt mode after closing the buffer.
When the B bit is set, the controller will enter hunt mode after the
reception of the BCS.
0 =The BISYNC controller will maintain character synchronization after
closing this buffer.
MC68302 USER'S MANUAL
4-73
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